I can’t think of any other guitar accessory that provide so much, yet cost so little money.
You don’t have to spend $20 for a pair of strap locks.
These little rubber washers can be bought at hardware shops. I pay a dollar for a few and they are the best strap locks I have used. BEST.
Just slip a pair over the strap buttons and you’ll get effective strap locks without breaking the bank. When they harden a year later, simply change out to new ones. 🙂