@Fogrye : Sorry to have scared you
I was freaked out. After a while i understand, that you are asking SpwnX.
The classes ihl.handpump.IHLHandPump and ihl.collector.CollectorItem override Item.getDamage(), which is a very bad idea for performance reasons. Please get rid of it if you can.
I hope this code instead:
...will safe a performance. Did you use a special ItemRenderer for that?
Fixed version (0.530) ready.