I run bladders in all my associated shocks, H.P.I. bladders. the trick to getting the right balance of oil and air, at least the technique I use would tgake me quite a while to explain. basically it's trial and error. but when you first place the bladder on the shock body, try catching the threads just right while screweing the shock cap on and it should get you the fit between bladder and cap you're looking for. I figured out which way works for me just by trial and error