You can get all types of answers about trapping limbs. Some guys say it makes for a lighter(faster) limb. Some say it helps with handshock.Some use it for tillering,deciding where the limb bends.Other guys use it to get a bow to make weight. James must have it figured out though.I had him build me a Serpentine years ago,heavily trapped limbs.It was the best r/d longbow I've shot to date.If I didn't make the switch to 100% American semi longbows,I'd still have that Serpentine.It was my last R/d longbow to go.