I've never tried shortish enlarging lenses for macro work, haven't felt the need because I have decent macro lenses shorter than 50 mm. And it has a preview lever, so is easy to use. The preferred shutter IMO is the Polaroid MP-4 Copal #1 Press. That's how I use my 4"/5.6 Enlarging Pro Raptar. With others that have filter threads in front adapters (male filter thread-to-male M40x0.75) to #1 shutters aren't that expensive. That's what I did when I was trying my Comparons out. With them reverse mounting the lens is easy, just put the rear cell in the front of the shutter and the front cell in the rear. 105/4.5 and 150/5.6 Comparons, 100/5.6 Componon-S and 105/5.6 Componon (I hope I got the right focal length with the right version of Componon) for example. Paul, some enlarging lenses' cells are direct fits in a #0 shutter. It's not as precise as the geared macro rail, but it works to focus even at this magnification.
I own a Linhof macro focusing rail, but I also have a long Arca-Swiss-type QR plate on the bed of this camera lined up with a short one on the body in the fore-aft position, so that with a long A-S-type clamp, I can slide the camera back and forth. This one's mounted on a cone that Linhof made for macro lenses like the Zeiss Luminars and Leitz Photars. The setup hardly looks like a freight train, if you use a short lens.
The film is Type 55, and the exposure is 16 minutes at f:11, with an additional 25% development time to keep up the contrast. The lens is a Canon FD 35mm f:2.8 macrophoto. In case you can't see the shot I linked to in the gallery, here's the photo showing the surface of a cactus.
Strobes help keep things sharp as well, if the setup isn't solid enough to tolerate a long exposure. I've also used the modeling lights from my studio strobes. A bright LED flashlight will do, if it's close enough.
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