You could contact Krikor Maralian at Krimar Photo Shop in Elmwood Park, NJ,
Krikor used to work for Marflex and has had his own Photo shop for over 25. He is one of the best technicians for older Rollei cameras in the US. He has kept my Rollei 3.5F camera in great working order over the years and has done other work for me on my large format lenses and also on my Linhof cameras.
Krikor's address and phone are:
Krimar Photo Shop
1058 Broadway (Rt 4)
Elmwood Park, NJ 07407