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These guys all talk too much but here are a few other ways: Vacuum gauge Manometer

to use a piston stop you need a degree wheel, or some way of measuring/marking crank position. the process is as follows: put in the stop, slowly rotate the crank until the piston gently stops against it, mark the degree wheel (or in your case, make a mark on your crank pulley indicating the 0 pointer) rotate the crank in the opposite direction until the piston gently stops against it, mark the degree wheel (or in your case, make a mark on your crank pulley indicating the 0 pointer) tdc is now exactly halfway between the two marks (or degree wheel readings)a degree wheel is just a big circular plate with degrees marked around the edge (like a 360 degree clock face). you can find one online, print it out, glue it to something flat (plastic, cardboard, metal, whatever) and mount it to your crank pulley, then you'll need to make a pointer of some kind that will read against the degree marks (an L-shaped piece of wire will do) and bolt/clip it to the engine so you can see/note the crank degree position. you can also wrap a tape measure around the crank pulley (a tailor's tape is perfect because it is flexible) and use those number markings. again, for finding tdc it doesn't matter if you use degrees, inches, milimeters, whatever, it just matters that you can record the crank pulley position on either side of the piston stop, then split the difference accurately. using a degree wheel is specifically needed if you're trying to do very accurate measurements of specific degrees for cam timing (not an issue here). hope that helps... probably a youtube video which explains it better than my words...

"Nature friendly" fuel could be hydrogen, natural gas, or even farm animal waste. Ask your friend where he fills up his tank. Dennis

Now I know why all those wheel bearings are shot ::

Passenger will have clean feet on rainy days.

That's the assumption. I built a piston stop from an old spark plug. It was so easy, and easy to use that if I ever get another engine, checking the marks at TDC will be the first thing I do. Too much time spent wondering what's right otherwise. I checked my one spare engine and it was correct. Comforting to know the lump of metal taking space in the garage is correct. Here is the easy piston stop build method. I messed around once before, but the key is the hack saw. I think an 8mm tap was the right size for the bolt. A grinder helps to round the bolt corners. The plug I used wasn't even glued, the ceramic just fell out. The hardest part after that is carefully rotating the engine so that you don't doink a piston in to it. p.s. that's not me, I stopped wearing flannel many years ago. No offense.