RE INDEXING SCREWS

[Paul Harm]

To index a screw, you can hand tighten it in a electric handdrill and useing a small file on the under side of the head take a little off. Try it, and take a little more off if it isn't right. I've never noticed the head sitting lower than the surface around it by useing this method. Paul

[Paul Harm]

Shims are not the right way to do it. You wouldn't take it to a gunsmith and expect him to fix it that way. Take the screw out and lose the shim and you're back where you started from. It's very easy to take a bit off the under side of the head. Paul

[Big D]

I think you've got it bass-akwards. The shim is intended to raise a screw which is below the surface.
Taking more stock off the back side of the screw will sink it further below.

For the amateur - use a non-copper shim

[Chris T.]

Jack, You should be glad it was a the well line and not the copper line off of the oil tank