FBO plate over advancing

one more observation:

Halifax got me thinking, my tbar is a 15, so 30* at the crank. I wanted 16* at the crank, so roughly half the slot. The picture below has the 16* slots under the tbar. The inside of both pieces are flush, the fbo plate should restrict the travel by more than it does.

my micrometer needs a new battery, so I wasn't able to get slot readings last night

20230912_203533.jpg