VERY SIMPLE STRAP RETAINER: (FOR USE WHEN PLAYING WITHOUT A GUITAR CHORD)
Went on the prowl over the internet to locate some kind of strap retainer for the typical endpin jack on A/E guitars. Found string and rubber devices, etc. etc., and even a plastic insert shaped like guitar input jack. Decided to make a very simple and inexpensive strap retainer, as follows:
Obtained standard, blank, 1/4" guitar input from Radio Shack (not trying to advertise - was just convenient to acquire). Used jack having metal "screw on" barrel.