Hi
Great idea and having the clear top to see what is happening in the chamber is great to.
On machining oillite bushes, I worked for a science research lab and we never reamed the holes due to the reamer potentially closing the pours of the material. (This is what I was told).
Therefore, we always machined the bores with a HSS tool to a bore gauge. Not sure if this was just company policy or this is the correct way to machine oillite?
The Home Engineer