I have a 360mm Tele-Xenar in a compound shutter that has major speed problems. I have sent email to Carrol at Flutot's Repair, but no response. I am aware the lose of her husband and she may not want a contact at this time. Any other repair recommendations for this shutter or is there a direct, more modern shutter replacement for my lens? I really love this lens on my Pacemaker 4x5 or I would not go to all this trouble. Thanks!