Schaller S-Locks M CH

I have the old design Schaller locks on most of my guitars. Excellent quality. This new design has 3 "improvements" - 2 of them are great, 1 isn't. The old hexagonal nut and washer were a real pain - always coming undone and difficult to tighten. Schaller have solved this with the new design. The new locking ring is easy to tighten, needs no washer and using an allen key through the two holes in it you can really tighten it and you can lock it in place using a small screwdriver on the locking screw. Great design, big improvement.
Now the not so good news. The new "silent" locks require very very precise machining or they can be too tight on the button causing the button to unscrew as the strap moves or to not clip in properly. I bought 2 sets - by mixing and matching I got 1 set to work properly. Thomann replaced the poor quality ones in record time. Well done Thomann.
Comment for Schaller product development team. Do you really think that a guitarist playing in front of his Marshall cares about his strap locks rattling ?? I don't - I can't hear it !!!!! I want them to lock properly and rotate freely. Unless your are machining to the exact micron tolerance your new design is too tight