I'm glad you found that link so I didn't have to Frank!

WestMD:

Just by looking at the picture from the 'shooter perspective' of your loaded arrow... I'd say your center shot is off quite a bit. Pictures can be quite deceiving though. I agree with Frank as well... that it looks like you are nock low... while this won't effect left side contact with the riser... it will definately effect arrow flight. If your Martin is a single cam, it should be set up plum or 1/16 to 1/8 nock high (and that is the measurement from the bottom of the arrow... not the bottom of the nock! The nock and the bottom of the arrow are often at least 1/16th different from each other!).

There are two timing marks on the rest body and thumbwheel. When you draw the bow, you should see those marks come into alignment about 1-1.5" before your are at full draw. No more than 1.5"! I like to tie mine in place, but you can certainly use that clamp to the same end.