Thanks for the alternative mudgunner, I'll probably just get the ball and spring and the punch and instal it myself. In fact I may order a few balls and springs....
I like the ball and spring system and have more then one old wingmaster that uses it. I also have sling plates designed for the ball system and besides ,the one ball I had shoot out of it's hole only to disappear somewhere in my shop, I've had good luck with the old detent ball.