We want to speed up the way we do the tooling for door straightening hardware we put in. These require a 35mm hole at either end and a 10mm slot between them. We sometimes place these diagonally on a door, we can put the 35mm holes a set distance from the top and bottom corners to locate these, and they will still be in position even when the door is edited in size.

We would like to be able to draw a line between these points and give it a 10mm thickness and a set depth.

We have tried drawning a slot as using it as a proporational inner tooling but as this shape is altered in size, the width of the slot also changes.

What is the best way to do this?