Ok I might be late here but i just had some trouble with mine.
I welded the disc to the bolt, yes it was originally peened. It doesnt take much and you wont hurt the springs.
The problem was the lack of clearance between the weld on the disc face and the adjuster cap on the slave cylinder. The adjuster cap has the teeth all around the outside, was aftermarket, made in argentina, and the casting was machined about 2mm .080" off centre so that for half the turn it jammed on the adjuster disc. The brakes were firm at the pedal but did not work. You could not see it with the drum off, as the shoes can move free with the drum off. I found the problem at a local testing station's rolling road brake tester.
So careful not to use too much weld!
I mounted the adjuster cap on internal jaws in the lathe, turned it properly round, filed the teeth, and fixed it. And ground the weld on the adjuster disc down a bit.
