I have ended up wiht 2 pairs of DX M525 SPD's
the bodies and cleat mechanism are fine if tatty but the axles are wobbly and even when adjusted utter crap!
I want to refurbish one set so am looking for a set of good axles - have a 2nd set (pictured ) to trade for them (or sell even)
I've a set that I can dig out for you; They have the old aftermarket blue anodized screw in collars, it that's any good for you, I'd need to double check the bearings, but I think they're good?