it probably came with the short arm as well, not bent properly for you to do what you were saying about the bar hitting with the cam rotated. and for some reason I always forget about 5stringers and always say 2410/7410
SR's have very straight strings off the nut but not this one:
I have a friend with a Jackson Kelly bass who started with a plastic changed to a graphite nut and it took away a lot of his out of tune ness after a few divebombs.
springs come out easily since there is no tension on them if you wanna experiment.

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