After hearing all the good things everyone has to say about the Rapier II, I'm considering dropping the coins to try one out. In all the photos I see, it appears as though the top of the machine may be too thin to keep proper tension on the needle bar with a standard rubber band (unless you double wrap?), and I also don't see any type of needle glide or guide clip. My question is how are you guys maintaining tension on your needle bar to get proper ride?