You can have to much packing in the cap. If I remember correct they were only designed for 2 wraps. If you notice when you have the cap off the male end of the shaft log has a ( V ) taper,tapering in. So when you tighten the cap,which is flat inside, it forces the packing into the (V)around the shaft sealing the shaft. If you have to much packing. You must use a lot more force to tighten the cap to get it to seal. Also it could just bunch up in the cap and may not seal proper. Which could cause the shaft log to run off center. This is the case where more is not better.You should almost be able to tighten the nut by hand. Just make sure you have the correct size packing. Make sure you cut the packing on a 45 Deg. and put the cuts 180 Degs.from each other. Just because you can get more packing in the cap does not make it correct. The added threades and space in the cap are required to withstand the compression force on the seal and keep the threads from stripping. Bill