I have started a build by the name you see above. I already attempted something like this based on his plans but as usual I thought I had a better idea and it didn't turn out. I will say one thing for that build was it did turn over a couple of times on it's own but the valve system I made would sometimes hang up. Today I cut down that same cylinder to two inches long and tried my line boring bar for the first time. Not good, even though the tool seemed solid enough it still chattered and made a rough looking cut. I then tried my smaller finer boring tool and got much better results but in the end found some interesting things. During my cuts the bit would make some noise like it was hitting a hard spot in a couple of locations which I hoped would be OK. Once I had a smooth looking cut I removed it from the chuck and had a look down the bore, the pictures will show you what I saw, any input is welcome please. Has anyone run into hard spots in Brass? I have run into that when turning brake drums but they have a good reason for hard spots. I've now started on an aluminium cylinder hopefully I'll have better luck.