I know that this isn't a spyder product, but they're all basically the same thing.
I came across this purple beauty and discovered that it works, but is missing the velocity adjustment screw. Would I be able to go to a hardware store and buy a set screw, or do I need something with an oring on it?
If anyone knows what this is, please let me know. All the jewels have fallen off and there are no other markings on it.