This seems like a trivial type of item but it seems popular to use a spring instead of the screw ball on the arm. Anyone like to show me a picture of yours and I'll try and hunt them down and stock them? I figure it could save some guys a trip to the hardware store.
I went out and found these so I should have them on the site and ready for sale later this week. I only bought a couple dozen but if there's good interest I'll buy a bunch of them and keep them in stock going forward. I also might add them to the sets since it's a cheap and nice thing to upgrade the sets with for new users.