Is this what is used to ream holes drilled in peened bolsters?
Adam that will work but you will have to be very careful not to twist it in too far. What I do is to drill an 1/8th inch hole completely through the blade/bolsters then come back and step drill about half way through the bolster only with a bit that is only one size over in this case a #30 then install pin and peen as normal
I use a carbide rasp on my rotary.
Scroll down towards the bottom. It works well for me if I take it slow.
Thanks Bill. I'll try your route then.