Here's a strap lock that works for Yamaha style end jacks - The Acoustic Guitar Forum

Acoustic Guitar Strap Lock - Recommended?

Strap Locks for Acoustic Guitars? - The Acoustic Guitar Forum

Strap Jack

How to Use Strap Locks with Your Taylor Acoustic Guitar

Question for you luthiers: What do I need to know about strap

Here's how to install strap locks on acoustic guitars - The

Question for you luthiers: What do I need to know about strap

Strap Lock, any preference?, Page 4

Speaking out against barrel connector jacks

What Is a Beater Watch?

anyone use a locking strap? - Page 2 - The Acoustic Guitar Forum

What should a beginner guitarist buy? What guitar accessories do

Acousti-Lok Strap Solution for 3 Screw Output Jacks & End Pins. You can finally let go! MusicNomad's patent pending Acousti-Lok is a strap lock adapter that adds the safety & flexibility of using strap locks to your acoustic guitar without permanently modifying it. Designed to be used with SCHALLER style strap locks (not included), Acousti-Lok's strong solid brass construction gives you the security you have been looking for.

Music Nomad MN273 Acousti-Lok Strap Solution for 3 Screw Output Jacks & End Pins