I put the Lyman Brass trimmer into a plastic box before mounting it to the workbench.
I can reverse the bottom part of the mount to install the hand trimmer if I want to do so.
No more brass shavings all over the place which is what happens usually.
Space on the bench dictates the side to side mounting.
The mounting bolts go all the way through the bench and secure with wingnuts.
I keep spare parts and tools inside the box with the trimmer and mount to a vise on the end of the bench when not using it.
Happy Trimming! It’s not that bad if you’re set up correctly to do it.