SME 3 series Arm Lift Adjustment?

Can someone give me the allen wrench size to adjust the arm lift for my SME 345. I know it's very small, but I don't know the size. You don't see the bolt itself because it's hidden under the rubber. You access it through a pin hole in the rubber surface. This should be the same size as the IV and V.
I use a .89mm (.035") with my IV.Vi

Thanks, I just ordered one on eBay.
I found adjustment to be touchy and not very precise. It's not like I could suggest to turn the screw 1/8th turn and get a repeatable result, it was more like I had to play with it for a while to raise my lift to where I wanted it.

Good luck,