Amazon.com: D'Addario Accessories Flex Lock Strap Blocks - Locks Straps In Place - Protect Your Instrument with No Modifications or Hardware - Easy to Attach - Set of 4 Blocks - Black : Musical Instruments
Guitar For Thought — Do It Yourself Strap Locks
Beerwasher Strap Locks
Strap Lock, any preference? | Page 4 | Telecaster Guitar Forum
Rubber washer for under pedal knobs, or strap lock