I've followed the instructions, drilled a 11/32" hole into the bottom of a Nalgene water bottle (hard plastic). Now I can't get the darned thing in there. What am I doing wrong? I do not trust this company very much because they describe an 11/32 as being smaller than a 5/16... I'm no math genius, but I believe that 5/16" = 10/32", which is SMALLER than 11/32". Everything I've read about chicken nipples says, "do NOT make a bigger hole!" but not how to actually get it installed.