[quote name='Matt P' timestamp='1492343070' post='3279506']
i'm a schaller fanboy, you do need to enlarge the hole in the strap to get a nice flat fit, i use a dab of threadlock on the threads to keep the nut in place, i didn't used to bother and never had an issue with any of my straps but i keep a bottle of threadlock on my bench now so use it as a belt and braces insurance.
i had a good look at the designs of the different straplock designs before i bought them and the schaller design makes more sense in my head, i never trusted the dunlop design with the internal locking method, all of my engineering schooling gives me no confidence in the dunlop design, the idea of the wweight and the locking device on the pin inside of the button seems wrong, a bit of wear and i'd be afraid of it letting go mid-gig whilst the schaller design has the "cup" of the straplock to take the weight and the pin as a locking device.
Matt
[/quote]
You'd probably best not look into aircraft construction next time you fly if you dislike the idea of Cleco style fixings.
That 'cup' you prefer is a chocolate fire guard once the nut comes off the strap!