For knobs, try the usual suspects: McMaster-Carr and Reid Tool Supply. They have dozens of varieties.
I've owned all four of the superlight 4x5 rail cameras, the Toho (both the FC-45 and FC-45X), Gowland Pocket View, and Galvin. The Gowland was fiddly and I hated the friction drive focusing, so I quickly sold it. The Toho cameras are lighter and more rigid, but idiosyncratic (more so the 45X). Although a bit heavier, I preferred the earlier 45 version with the big rectangular rail. The Galvin may be a tad heavier than the Toho, but it is set up like a "typical" monorail, just lighter. For just a little bit more weight, you get (IMHO) quite a bit more ease of use and quicker setup than the Toho. However they are very rare and hard to find.
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