Easy / quick method I use only works on a pic rail only though:
I slide a small ruler in the groove of the rail (tipped back so it fits under the scope) and then tip it upright as much as possible under the middle of the turret housing (the base on every turret housing I have seen is always flat!)
The base of the turret housing will square itself against the edge of the ruler which is in turn squared against the edge of the rail. Easy as that.
I slide a small ruler in the groove of the rail (tipped back so it fits under the scope) and then tip it upright as much as possible under the middle of the turret housing (the base on every turret housing I have seen is always flat!)
The base of the turret housing will square itself against the edge of the ruler which is in turn squared against the edge of the rail. Easy as that.




















































