OK - I've grafted 3 times now and the bees clean and empty all my grafted cells by the 48 hour check. The cell producing hive has been left queenless for 24 hours, the bar of cells have been in the hive for a couple of days prior to grafting so the bees can clean them, I'm fairly sure the larvae I'm using is young enough (although I'm going to isolate the queen with new comb next time so I can exactly date the larvae at 3 days), I'm as careful as I can be "scooping" the larvae out of the cells (is it possible I'm being to rough?). Surely even if I am doing most things wrong I should still get 1 or 2 take out of the 48 cells that I am grafting. I am getting absolutely nothing but cleaned out cells? Any suggestions as too what I'm doing wrong or what I can check for? Is it possible it is too early in the season?