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The more modern plastic Watsons came with a 2 mm shim you removed for FILCA or fitted for IXMOO, most of mine don't have the spacer and I've not had any problems with FILCAs or IXMOO.
I try the bakalite Watson next time I find it.
I've been using my Aldens. I pulled a Watson out, loaded some bulk TMAX, and tried it with a FILCA. It worked. Obviously this will become my FILCA loader from now on.
Thanks a bunch for the heads up.

Although it is a plastic one, mine didn't appear to have any spacers in it that could be removed. Maybe it was removed sometime in the past. Most of my bulk loaders are yard sale finds.