I had a problem with the WWW swinger I had.. The pivot tube ID was too tight. After I pressed the bearings in I had to drive the pivot tube through with a rubber mallot.. and then it wouldn't spin freely.
Called wayne about it and he fixed.. But I was out $25 shipping and 3 weeks wait time. Had to buy another swinger while I waited for the other one to get back.
Havoc performance would be the shop I'd recommend for swingers. Great guys to deal with.