I, too, can highly recomend Ken Ruth at Photography on Bald Mountain, www.baldmtn.com Ken specializes in repairs to vintage folders as well as other oldies. He is currently working on my Agfa Solinette II folder and Kodak No. 1 Panoram. He has previously worked on 2 other of my Panorams and a No. 2 Brownie box, and soon I will be sending him a couple more folders, an early Zeiss Ikon A and a later Daiichi Zenobia.
I can also attest to Jurgen Kreckel's expertise, as well as how busy he is. I have bought a Zeiss Nettar and an Agfa Super Solinette that he has completely overhauled.