With the Music Nomad MN270 Acousti-Lok adapter system, secure attachment of strap locks to an acoustic guitar with an endpin jack is guaranteed. Show performances with a lot of movement are no problem and the worry that your valuable acoustic guitar could fall down and get damaged is a thing of the past.
The adapter is simply screwed onto the endpin thread instead of the cap nut.
Music Nomad MN270 Acousti-Lok Specifications:
Fits all 3/8 "x32 US threads.
Fits most Martin® guitars with Fishman® electronics, Taylor® guitars up to 2002 model year, Switchcraft® jacks.
Schaller S-Locks (Black Chrome)
Ernie Ball Straplock Black 
Dunlop SLS1033BK StrapLok Strap Retainers Dual Design (Black)
Dunlop SLS1031N Straplocks 
Schaller S-Locks (Chrome)