I don't have an answer to you problem because my blades don't move, hinge, slide, pivot, or require an o-ring.

As much as I try to educate people about broadheads at the shop and here.... the one piece of equipment that should be as simple and reliable as possible people just want to make it as complicated and prone to failure as they can get them. Honest to God, I don't know why you guys want to go through so much trouble with your broadheads.