Ok, I was trying to eliminate the dizzy rotating a bit.
I don't have an FBO plate, but you could measure the slots to make sure it's the correct slot. I know they are marked but it's something else to eliminate.
dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520
