Thanks for your response Nick. I'm not sure, but I think he might want a flash taht will shoe mount with his 35mm (for the sake of compactness) but handle mount with his medium format. He's probably willing to get either used or new, as he bought a lot of his current equipment used. His A2 35mm SLR probably has some special flash circuitry, as it is an EOS model camera, but I'm not exactly sure of the specifics. Do you know any shoe mounted flashes similar to the 544 or 555? Other than it not being shoe-mountable, it seems perfect. I'll have to check with him though. THe 544 might be just what he's looking for.
Regards.
~Karl Borowski