I just crafted a temporary fix to keep my revolver functional until the new spring arrives. I have a few spare extractor spring inserts for the bolt in my ar15 laying around. Took one and shaved it down a little so it'd fit down the hole and act as a shim increasing the tension on the spring. I made sure the extractor insert fit loosely in the hole so it doesn't get wedged in there permanently. Put it back together and tapped the handle and the cylinder stayed locked up just fine!