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Built using a DM450 spar from Dwyer Mast to test fitting.
The oblong hole in the base of the insert was added to prevent sliding of insert when slugs rub on it during passage.
With the insert centered within the feed slot, look into the track and use something to mark the center location of the oblong hole.
Remove the insert to center punch the location with a nail. Drill & tap for a small nylon or stainless allen set screw.
BUILD ITERATION: DM450 pg465A 102mm OK (June,5,2020)