I know, but it's what I've used for the last 10 years strictly for firewood. Almost all are uprooted trees or trees taken down by pros that I would cut up.
I've been getting into some larger stuff, over 30" diameter the last couple years and the 029 works fine if I take my time, I just want a little more power so I bought a 49mm p/c for it. I then realized all I needed beyond that was a crank, pan and bolts to have a complete engine that I could just swap out.
According to my tap chart, it looks like I can tap an m6x0.75 still get 75% engagement. I guess that's the way I'll go with it.
I'm also going to assume it's bad practice to reuse these bolts on a new cylinder? I ran one in slowly, using cookies method and the treads on the bolt looked halfway stripped. Really seems to be a piss poor way of doing things.