If you can find a "proxar" or similar close-up diopter in an appropriate diameter or bayonet fitting, that is as good as you are going to do. there were add on lenses for wide angle, tele and close-up, made for most of the TLR cameras by various people over the years. most of them were expensive and rare now, or were cheap then and are still cheap. the problem with trying to use a TLR for macro work is the parallax. mamiya made a gadget the you attached to a tripod called a Paramender that was supposed to allow you to focus and do your setup with the camera lowered on this thing, then after you were happy with the setup, you raised it on this device and it moved exactly the distance between the lenses, placing the taking lens where the viewing lens was. if everything else stayed the same, then you would get what you were looking at on the ground glass. these are a must have device for attemtping macro work on a TLR.
I would call up Perter's camera store and see if they still have anything like the old add-on lenses for TLR cameras, a call to KEH or B&H photo's used department is also worth a try. if both of those bomb, Bill Cameta's camera, and Brooklyn camera exchange, have a lot of vintage and obsolete stuff. all of these vendors can be found in shutterbug magazine.
2cents@large
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