Hi Captain! I was thinking about you!
If I were you, I was able to take it off easily and put a perfect piece for the vacuum. 
You have skills and professional tools! 

Do you mean the remaining piece can be pulled out by using some tools like an ultra micro sliding hammer (I don’t even know such a tool exists)? or drilled (scraped) out by a drill bit?

About the cylinder, yes my current cylinder is made by NABCO but I want TOKIKO lock type cap which looks period correct for my June 1972 car. 
 

Kats

2 hours ago, kats said:

About the cylinder, yes my current cylinder is made by NABCO but I want TOKIKO lock type cap which looks period correct for my June 1972 car. 
Kats

Hi Kats, I know you look at eBay in the US.  Are these too expensive?

https://www.ebay.com/itm/235682782552?_nkw=datsun+240z+brake+master+cylinder+cap&itmmeta=01J67QJ9PY0AS770M2QXW1T476&hash=item36dfc9dd58:g:K2MAAOSwjqNgPFM8&itmprp=enc%3AAQAJAAABAHoV3kP08IDx%2BKZ9MfhVJKkgEI8xlrOrXR35ZVEauWhWy3b8zqM5sCMdsPS%2B6W3J1gShEGzW56wS9%2BnAJ57eSUYPiXhT2D6XTQLZmKj9x85i31Kt6IooZKn4Sx3mT5vUNWaVGsIRnMyhcxGwYZJ2Hgnww%2FiWahettnb9CA7%2BQHysIe6DnRn683anTugQjDTwOkVbycEemnRtOZKwFIDGcZAAI09Gc%2B9EnVkTT9OZras%2BdFMv04JujhXmtUyosCFGeZI68fy62idnDVpZbRC2KqRdOH%2FDSaNqZ1--0AQZ%2B4PuGZJOCidpcoNO3tRNpvtPXV%2BUW0Td8LqreQYYFC2GITM%3D|tkp%3ABk9SR8ibyfexZA

Hi Kats, If I were trying to get that piece out, I think would use a small tap to thread the inside of the brass piece. Then once there were threads inside, I would use a screw as a handle and try to pull it out. I would also make a small arbor that I would put between the screw and the carb body. I have made similar adapter arbors in the past and I will take a picture tomorrow of something similar.

Also, I've messed with other similar fittings on the carbs and they are usually very tight, I would use heat before I tried to pull it. Small butane torch.

And if all that fails, I would use progressively larger drill bits and drill out the brass until I could pick out the small pieces.

12 hours ago, inline6 said:

Hi Kats, I know you look at eBay in the US.  Are these too expensive?

https://www.ebay.com/itm/235682782552?_nkw=datsun+240z+brake+master+cylinder+cap&itmmeta=01J67QJ9PY0AS770M2QXW1T476&hash=item36dfc9dd58:g:K2MAAOSwjqNgPFM8&itmprp=enc%3AAQAJAAABAHoV3kP08IDx%2BKZ9MfhVJKkgEI8xlrOrXR35ZVEauWhWy3b8zqM5sCMdsPS%2B6W3J1gShEGzW56wS9%2BnAJ57eSUYPiXhT2D6XTQLZmKj9x85i31Kt6IooZKn4Sx3mT5vUNWaVGsIRnMyhcxGwYZJ2Hgnww%2FiWahettnb9CA7%2BQHysIe6DnRn683anTugQjDTwOkVbycEemnRtOZKwFIDGcZAAI09Gc%2B9EnVkTT9OZras%2BdFMv04JujhXmtUyosCFGeZI68fy62idnDVpZbRC2KqRdOH%2FDSaNqZ1--0AQZ%2B4PuGZJOCidpcoNO3tRNpvtPXV%2BUW0Td8LqreQYYFC2GITM%3D|tkp%3ABk9SR8ibyfexZA

Thanks inline6, eBay selling the cap! But it is expensive for me. Japanese currency is now way low compared dollars, I can’t enjoy shopping from USA anymore. 
 

So I have got a set of the cap at a local car workshop. They were a half of money which I would pay for the one on eBay. 
 

Kats

3 hours ago, Captain Obvious said:

Hi Kats, If I were trying to get that piece out, I think would use a small tap to thread the inside of the brass piece. Then once there were threads inside, I would use a screw as a handle and try to pull it out. I would also make a small arbor that I would put between the screw and the carb body. I have made similar adapter arbors in the past and I will take a picture tomorrow of something similar.

Also, I've messed with other similar fittings on the carbs and they are usually very tight, I would use heat before I tried to pull it. Small butane torch.

And if all that fails, I would use progressively larger drill bits and drill out the brass until I could pick out the small pieces.

Great!! Using a tap and a screw, and apply some heat. Those methods would never come up in my mind. 
 

Thank you Captain! I have learned new things today, it will be helpful for my future restoration work. 

Kats

 

Kats, Here's some pics showing what I would try:

You're starting with something like this. This is a different carb, but the situation is the same:

Tap some threads inside the hole. You may have to drill it a little first to the appropriate pilot hole for the tap. This is an English 4-40 tap, which is close in size to M3 x 0.6:

Then I made a little puller adapter to concentrate the force in the perpendicular direction to pull the brass slug out of the carb body:

Put it over the brass slug and carefully run the screw in:

If everything goes according to plan, it should jack the brass remnant out like this:

If it doesn't come out easily, maybe try a little heat from a small torch:

And if that doesn't work, you might be able to get the piece out with a drill like this:

10 hours ago, Captain Obvious said:

And if that doesn't work, you might be able to get the piece out with a drill like this:

Thank you Captain!! You show how we can go through the challenges. I remember you did some amazing work 

when I was wondering about the Works wheel nuts.

Kats

On 6/3/2024 at 3:45 AM, kats said:

Thanks Patcon! 
I am enjoying to see your restoration of your 240Z, keep good work!

Kats

PS Nissan blue is still available from local dealership or some internet vendors. You can order with the parts number 10128-90026.

Or in Japan only?

 

Sucessfully ordered from Japan! Shipped by sea. More than 1, as min number could be ordered from supplier....

On 10/23/2024 at 9:08 PM, RIP260Z said:

Sucessfully ordered from Japan! Shipped by sea. More than 1, as min number could be ordered from supplier....

Hi Ian, you made it! You will be so satisfied with the color when you paint your block. 
 

Kats

On 8/28/2024 at 1:28 AM, Captain Obvious said:

Kats, Here's some pics showing what I would try:

You're starting with something like this. This is a different carb, but the situation is the same:

Tap some threads inside the hole. You may have to drill it a little first to the appropriate pilot hole for the tap. This is an English 4-40 tap, which is close in size to M3 x 0.6:

Then I made a little puller adapter to concentrate the force in the perpendicular direction to pull the brass slug out of the carb body:

Put it over the brass slug and carefully run the screw in:

If everything goes according to plan, it should jack the brass remnant out like this:

If it doesn't come out easily, maybe try a little heat from a small torch:

I have small inner pullers for this stuff , works great. just add some heat first before pulling

Hi Kats,

Unfortunately the shipment of the spray cans was cancelled shortly after placing, even shipping by sea from Japan looks not possible.....