If you mill down to the flange, more than 1/2 of the trim die window is above the tool head. The 650 with the deck cut works great with the vacuum attachment.
The 550, if you cut the entire deck down, the other dies positions are hard to use, and there is not much room for die lock nuts under the press due to the indexer. A pocket cut down to the flange works, and then a 1/4 pocket under that station so you can place the trim die lock nut under the toolhead. I've compared many different 550's and some had a 1/4 inch difference in clearance between the bottom of the toolhead and the indexer.
These for the 650 or 550 are $50 plus shipping.
Once you set up for trimming, take care of your Motor, cutting the blackout make LOTS of heat.
Threaded Mode