Transplanting a 135mm Carl Zeiss Tessar shutter into a Busch &Pressman

A few weeks ago I got a very well preserved Busch & Pressman. Although the shutter is flawed from 1/10 to bulb it still seemed like a good deal to me. The point is that this one needs a CLA and until I figure out its proper functioning I wouldn't want to stop using the camera. So I was thinking of transplanting a Zeiss Ikon Maximar shutter (the classic 135mm Tessar) to the B&P without compromising the folding camera assuming this would be a reversible operation. I have seen on Ebay that certain press cameras are sold with these Compur shutters, I would just like to know if someone has done it here, if it is possible to go back and if so, what would be the steps to follow to remove the shutter.

Thanks in advance.

Ilich

1. Open the Maximar camera's back, remove the rear lens cell and measure the outside diameter of the rear of the shutter.
2. Remove the lens board from the Pressman and do the same. If the diameters are the same then unscrew the shutter retaining ring from both shutters and install the Maximar's shutter on the Pressman, if the diameters are different they will not interchange.
Maximar's shutter larger than the Pressman - the shutter will not fit into the mount hole.
Maximar's shutter smaller than the Pressman's the shutter will move around and likely leak light.

Also worthy of note -- it's not particularly difficult to fabricate workable lens boards with any size hole you like. I've made several from two layers of 1/8" Masonite, laminated with the textured sides together (carpenter's glue a la Titebond II works great). The rear layer is reduced in size to ensure it fits inside the front standard, and a layer of foam or felt can be added to make up thickness so the slide latch holds the board steady (vs. allowing a little front to back wobble). A hole saw or fly cutter can be used to drill the center hole, and of course the hole in the rear layer should be larger to accommodate the lock ring.

I've made a couple of these to fit my Anniversary Speed Graphic and Graphic View -- a drill press is very helpful (especially if you use a fly cutter -- these are very hazardous to use in a hand held drill). Masonite is cheap, so is wood glue. As a finishing touch, I painted the rear surface with India ink from an art supply; it's very black (carbon pigment), pretty inexpensive, and soaks well into wood (or wood by-products).

This way, you can keep the shutter you got with the Pressman in it's original board (or at least keep the board when you dismount the shutter to send off for service) while you use the camera with the Tessar in its Compur.

Thank you fellas.

So, looking around google I found a 3D file that fits perfectly with this shutter. I didn't even need to modify the file.

https://www.thingiverse.com/thing:3090594

The somewhat special aluminum boards with the 90 degree tab to lock to the Pressman model D (4x5) camera can easily be made from hobby shop aluminum although now some replacements using 3D printers seem to be being made.