I ended up having a sizable gap around the piston, which resulted in a fair amount of blow-by. I started by gluing a short dowel alongside the main dowel for the shaft, along with the blocks.


I then cut away most of the shaft itself with a band saw, and whittled what was left round. For the bearings, I just ran hardwood on hardwood, with a little bit of axle grease and oil on it.






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