I curious on this myself, seems to be 2 schools of thought:
1) HCG through out the cycle, split between 2 doses of 500ui each (for say a 500mg/wk dose of test), taken the days after test pinning. (so test sun / wed, hcg mon/thurs for example).
2) Dont bother with HCG on cycle but do a blast of 1500-2000ui EOD directly after the cycle (between last pin and start of PCT + week 1 of PCT). There was a great article on this method posted on steroidology, ill post it if I can find it, Im pretty sure it was from cashout.
Interested to hear what everyone thinks about this.