DNX408 Shocks?

[av4625]

Once i heard of guys cutting the middle out of the bladder and basically using them like the 1/10th scale i thought i wud like to try it on the weekend so when i was building up the shocks and had the cap tightened when u push the shock up little bits of oil kept coming out of the bleed hole i was wondering has anyone tried this with the 408 and how much of the bladder i shud be cutting, i had some bladders split at the edge so wen u cut the rest out i was left with wat looked like an O - ring did i take to much of or is it possible even to do this thanks?