haha thanks crosbyman, I wish I could take credit for that one. I actually got it from a fellow local outboard guy years ago. A few things I did, if I remember correctly….after taking out the core, I put it in the vise “bottoms up” with the threads clamped in the vise, it doesn’t matter if the threads get “squished”. I used a 1/4″ bit, variable speed is better cuz if you go too fast it may have a tendency to grab and twist the whole thing. Go as fast as you can without binding but start on the slow side. After the brass innards are gone, then cut to length and I think I might have used either a Dremel cut-off wheel or hacksaw. At that point with just rubber remaining even a diagonal cutter probably works.
