Hi all,
I have been trying to make sense of the marks on the wedge degree marker they run from I think 85 at the top of the rod to 20 at the bottom but if I raise the wedge till it is close to 21 there is no mark for it but the angle is too big for 21 degrees. I know it must be me not understanding it properly I haven't been able to find anything on google or in the instructions to explain it please help.

I have attached pic's to try to show what I mean.