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Routing and Mounting styles

7200 TOM mounted
7300 Flat mounted
7410 Flat mounted

Whether its a 4, 5, 6, 7, 8, 9 or 10 string tremolo, the routing depth in the body top is always 1" deep, as seen below. Most basses in general need to have the tremolo or bridge countersunk into the body to achieve the right action and string angle. To help you pre-fit your new Kahler to your guitar or bass, you can download and cut out free routing, sizing and adapter plate templates here.

There are 2 different mounting styles: TOM or Flat mounting.

If you have a Tune-o-Matic (TOM) bridge, whether the body is flat topped or not, you'll want the 7200 model. The TOM mounted 7200 has 2 hooks on the side of the frame. These hooks will go around the posts just like the stop tail piece does on the Tune-o-Matic and mount up like on the Les Paul (top left). Flat mounting tremolos are generally square shaped and use four wood screws for installation and the unit is simply screwed down to the flat body top over the routed cavity. (top, center and right)

SPECIAL NOTE: In the 80's, Gibson's and most guitars with Tune-o-Matic bridges, had a standardized installation location that was programmed into the routing machines at the factory and in those days, Kahlers were a drop on perfect installation. But since the late 80's - early 90's, the stop tail part of the Tune-o-Matic bridge has been shifted around like the grills on a Chevy over the years. The bridge part is always in the same place for the scale range of course, but the tail piece is not as important. It can go anywhere since all it does is hold the strings. Unfortunately the Kahler needs these studs to mount on and since they are no longer in a standardized locale, the studs sometimes need to be removed and relocated in the right spot. You need about 2-1/16" to about 2-1/4" between the bridge sections small E saddle notch (which should be set to the scale length) and the center/middle of the stop tail piece to be "in the ballpark" for mounting a 7200 without having to relocate the studs. If you have to relocate the studs on a Tune-o-Matic setup for a 7200 and its a flat top body, you can use the PL-8 coverage plate to surround the base and the relocated stud holes. If you have the one piece stop tail/bridge or a wraparound type 1 piece tune-o-matic, then you don't have a problem with relocation. This step can be skipped since you will be drilling fresh new holes for the rear studs and the install will look perfect. Imperial drill bit set for 7200's. I always suggest a qualified luthier to do the job. See my choices for qualified luthier's.