I have a set of iron dumbbell/barbell using 1" spinlock (York I think). Ever since new the collars come loose within a few reps even though they have a rubber insert.
I was wondering can I use other collar types on spin-lock bars, or are they only compatible with non-threaded bars? I don't want to replace my entire set, but collars of various types (I am not very familiar how they all work) all seem quite cheap. It would save time as well!