U want the flop as the pulley needs to flop when u tack otherwise it will b about 60% off angle when u backwind ur headsail before tacking otherwise the sheet would b chaffing off the base , thats why I bought the one,s with the line guides in front of them , they r designed to flop for that reason http://i844.photobucket.com/albums/ab1/ ... 010007.jpg
Just sayin Thats All !
Now if u want too stop them from flopping around loosely then u can remove the bolt lift out the complete pulluey & holder assemb. & insert a strip or piece of rubber tape under neath then re-assemble if u look closely at the pic of mine u can see the rubber button in the middle of the base that does the same thing
mine came from Garhauer with them in there
PS Make sure u put some blue loctite thread locker on the bolt threads one of mine came off when I first used them , so I loctite them all