They do not appear to be the arched ones. On the arched ones, the bridge is much taller than the neck, just like a Les Paul. In the photo, it looks like these two rings are the same height. (Sorry Jolly/Shooter/Johnny)
The warpage is exactly that. They either came out of the mold that way (as in they were still cooling down) or they saw excessive heat before you received them maybe?
But yes you've chosen to install them "upside down" vs the way they were intended. That means the switches will seem to work toward opposite coils vs. the way the wiring diagram suggests.
I've seen warped rings before and it's more often than not the case of misaligned holes. Even a slight misalignment of 1mm can cause this problem to occur.
I will use them, but like I said, once you install a pickup with them, keep the pickup and the ring together. That and maybe a touch of hot glue at the wire junctions.
It came like that. The screw holes lined up fine.
Frank is right, they ARE the same height (just look at the shadows).
I've been using TS rings since they first came out, and have them on at least 10 guitars. ANY warpage that I have personally seen has been due to misalignment of screw holes. I have never seen one warped before installation.
It doesn't take much of a misalignment of the screw holes (certainly Not as much as 1 mm as Orpheo said...he was being kind) to cause the warping problem...even 1/4 mm off will give those results. Expecially if the existing holes in the guitar are not perfectly square (a slight parallelogram or trapezoid pattern) or even if the holes seem to line up but are drilled at a slight angle, either or both of which could very well be the case in "a cheap/budget guitar".
I would suggest taking out 3 of the screws and slightly unscrewing the 4th to let the TS "relax". I would bet that there is (at least) one screw that doesn't perfectly line up. Fill and redrill that hole(s) and you should be fine.
Please, give any reference, site, forum, etc.Here in the UK, largish group of guitar modders
Hi Lt K
Thanks for your interest
Will PM you after Christmas
Have a Great Christmas and New Year