A: If your guitar has a front endpin (strap button) on the back side at the heel of the neck, then it's best to use a Lock-It strap with a "reversed" front end. Some examples would be: ES-335's, SG's and many jazz guitars. The best solution would be to have the lock's thumb button facing AWAY from your guitar's body. Although it's entirely possible to use one of our standard straps with the lock button facing away from the guitar, there would be a half-turn twist in the strap. Having a reversed front end Lock-It strap prevents this twist.