Steltzer

Help! This problem is killing me.
2003 lancer CS6A ES CH 2.0 4G94

My car has bad belt squeal.
This has been going on for a couple of years now. I replaced the belts, was ok for a while.
Then I found belt material building up around the alternator, replaced that, was good for a couple months. It has come back, and I have just replaced the ider pulley. Now it is worse!
I am just about 100% sure now it is idler pulley misalignment.
So here is my problem.....HOW THE HELL do you put tension on the pulley, with out the tension bolt torquing to the right!?!?
Looks almost like bad design. Surely this is a big problem, and there is a simple fix or “kit” for it?

Maybe the bolts bent......hhmmm...