dude i love knife hits, i do them everytime i get some hash. u only need to heat up one knife tho, and imo it saves more hash, and that way u only ruin one knife instead of two.... just set one knife on the counter with some hash on it, heat up the other knife, pick em up and touch them together. poof magic smoke!!!!lol it works really well if u kind of rock (so to speak) the heated knife back and forth on the cool knife.
try using a straw or just the cardboard part of a paper towel roll or tp roll, these work the best by far, u get fat hits once u get it down!!!! those wonderful ones that give u the instant head rush like u just did whip-its or somethin......
happy smokin :rasta::jointsmile: