Re: Forester Case trimmer / Neck turner
I had to loosen the screw that holds the collet holder to the base on mine so it lets the holder just barely float in all directions, up, down, left and right etc... enough so that the neck of the case that's locked in the collet will just barely not go over the pilot if the case neck is held up, down, rt or left etc.
I did this because if it was tightened down in the collet, and the pilot was loose enough to let the case be turned on it without a bunch of excess effort, it would still leave it loose enough on the pilot that the cutter would cut the necks thinner on the side.
In other words, if the collet when tightened on the case head was *torquing* the case neck *down* on the pilots top edge (run case off, then back onto the pilot and it *hits* slightly on top, not the bottom) it will cut more material off the bottom of the neck because the collet will not let the cutter force the neck against the mandrel as it rotates around it... you basically don't need a mandrel when running the cutter around it, the collet holds it that firmly in position if tight enough to keep the case from spinning from the cutter digging in and cutting.
Solution was to loosen the holder screw and let it float on the mandrel on all sides as it cut, while the collet could still be tightened enough to keep the case itself from spinning. Case necks still need to fit the mandrel as tight as possible.
The K&M, Sinclair etc, they will let the case float on the pilot so it isn't an issue with them, that's why I got the K&M unit. I never got any better results that .0005" to .001" variation in neck thickness with the Forrester, and that took loosening the holder to get that close too. Without doing that, I was getting .001" to .002" variation... sometimes more than I started with too. Using it to fit brass for a tight neck it works well but, I don't like it for trying to get them to zero variance in thickness.
Good luck with yours, just thought I'd share my experience with mine... something to look for.