Calibrating a blocker?

[shawn.zachry]

I have a blocker that seems to block each eye one millimeter out per eye. Everytime I make glasses IF I dont compasate for it, I am consistantly off by two millimeters. Any suggestions?

[Chris Ryser]

Maybe you should give the make of your blocker so that anyone who has the same can give you a quick answer.

[shawn.zachry]

Maybe you should give the make of your blocker so that anyone who has the same can give you a quick answer.

I thought of that but I wasnt sure how to write it. It says AIT industries- speede.

thanks