John, you are right that Parker avoided patient infringement by changing the engagement with the barrels. However, my use of the word Deeley was meant to distinguish it from the wedge and friction retained forearms of some Parkers.

If all else fails just contact Dave Fjelline and send it to him. He does not let work stack up. He usually takes care of each job as it comes to him. Can't beat the work, the turn around ant the price in my opinion.

You can make small flat springs from auto “feeler” gauges. Measure the thickness of the original and match it as closely as possible to one.

Did you ever find a source for this spring? I would like to find one.

I have quite a few if anyone is still looking for one