Hi Robert, the traveler arrived Tuesday and I finished installing it today. Thank you Tim for all your help! Here's my best try at step-by-step description
Great quality from Garhauer, the track dimension ordered (41" with a 1.0" chord height at the center) fit perfectly. I elected to use the existing teak riser. If you replace the riser you can fit about a 48.0" track between the coamings and have an extra 3" 1/2 travel per side. The Garhauer end stops bolt on and take up very minimal room. But the control block & bumper take up about 5.0" on each end, so even though the track is the same length as the original, the effective length the traveler is a reduced about 10.0".
The MT-3 track is 1.25" wide and very robust. If you use the existing teak riser and bolt holes, the car will interfere with the coaming at the back of the cockpit and so the track needed to be raised about 0.250-0.375". I decided to use the old track as a spacer, it is 0.375" high by 1.0" wide and seemed to work well. (I may make a custom 1 1/4" x 0.375" spacer next year).
I removed the old track and re-drilled the 11 mounting holes to 0.375" (so that they would not interfere because of misalignment with the 1/4 x 20 mounting bolts). I then re-installed the old track under the new track. The holes in the teak riser were sufficiently accurate that I only opened them up to a standard clearance for a 1/4-20 (17/64"). I took the opportunity to clean up the teak and countersink the holes in the teak to allow for better caulking. I inserted the bolts in the new track and through the old track, starting at the center and working out to each end.
In order to mount the track you need to move the traveler control cars which are located with Allen screws and also you also need to unscrew the rubber bumpers. Everything is nicely coated with never cease.
Do not remove the car from the track....it uses re-circulating balls and if you take the car off the end of the track, the balls will drop out and drive you mad trying to put them back (it even says so on the car). But don't ask me how I know, I just know!
I used 4" 1/4-20 FH bolts, (3 1/2" would be adequate, but not so easy to find). I used self locking nuts and over sized washers on each bolt. Access was through the starboard locker and through the engine control panel. It helps to have a socket wrench set and deep sockets.
The installation (just as Tim said) was pretty straight forward, and I'm really satisfied with Garhauer's quality.
Here's some pictures. Good luck with your project!
Good sailing
Bob
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