Ok guys i'm using a 2nd hand Evolution 2 hopper and i'm not getting anywhere near the drop rate i want. I have brand new duracell batteries in it but it seems the balls are being fed in drips n drabs. Now so far i've only tested it with reballs, does this have anything to do with the problem? I was thinking maybe with them being rubber they may be harder to get down the hole in the hopper? Hmmmmm any ideas?