I let the hole saw wobble a little bit and it made the hole a little lose and it leaked I just put black tape on the barb to make it bigger and no leaks...I also put just a little lube on the rubber....helps it slide into the rubber...and it helps if you want to take it apart....
I don't think I would use a white bucket....notice my hole is fairly close to the bottom...it helps to pump out all the nutes when you change the barrell....here's some pics
