I'm late to the party but I just use the rubber seal from this kind of bottle on all my basses. It's cheap and reliable.
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Yo that’s actually pretty smart!
I am using the ones from Ernie Ball. So far I am happy with them. But be aware that the strap will be about 1.5 to 2 cm away from the body of the bass. It is just a matter of taste, but you should consider that.
That’s fine! The Warwick ones have a similar distance. I also found out what’s wrong with mine: The body attached lock is so worn out that the spring loaded balls slip out of their locking groove.
I've used the hard plastic ones from D'Addatio but they're difficult to put in place or easily remove.
I've switched to the cheap rubber roundels from Harley Benton and I find them practical. I like the colours too: straight black or a nice kind of pink.