So my observation was wrong , but like I said these complications is what make this hobby entertaining. Glad to see that the gremlin was discover

Grats on finding the problem. It had me stumped what it could be, only in reverse mmm? Reading your solution it seems quiet obvious, but thats happen often. Rotating sounds can be misleading. Thats what makes it fun to have a classic otherwise it would be boring and just a regular ride like most cars on the road.