Not sure how those prop locks work. But I can see you have a Mercury engine and the lock nut and the bendable tab washer work on the stainless just as well as the aluminum props. Is there room on the threads to have the regular nut and washer first, and then the lock over it to prevent access to the nut? For that matter why not just take the prop off when the boats not in use? Can't steal what's not there. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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