I've gone through about 15-20 Modify springs in the last couple of months. S90, S100, S110, S120. They've all worked perfectly and are very consistent spring to spring.
Modify bearing spring guides and Modify bearing piston heads in a lot of setups...still enough clearance to fully compress...or I wouldn't be using them.
Jugglez can't keep enough of them in stock...I buy 4-6 at a time, unless he's run out (as of tonight...he's out of S120...
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Tys