[AdamHeard]

Unless those are both COTS pieces I am unaware of, modify most of the pieces substantially to make them easier to produce.

Ideally, make it so as few machining operations as possible are required, and no machine operations are done for no functional reason (the excessive amount of rounds).

Get rid of all the external rounds, especially the one on the bearing bore, that would interefere with it's function,

I would switch both pieces to a solid block with a flange on the bottom for mounting.

Also, the mounting holes look like they would interfere with both the tensioning bolt, and the body of the block.

Your machinist will be happier, and your parts will get done faster with the same functional performance; win-win if you ask me.

Don't take this negatively, your idea is still a good one, the implementation could just use some work.