Thank you for all your replies. I have to say, I have noticed that the 501x standard spring seems far too soft.
Does anybody know where to source the 511x slipper spring? As the double slipper set looks to be about £30 (I'm not so keen on hearing that there are differences in the BK2 diff spring either.) I'm not in any particular rush, so foreign suppliers would suffice.
I've managed to find the replacement 501x spring for about £2 which seems more reasonable; but not the 511x counterpart.
Julius.
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