My suggestion is to return them and order 5x7 holders from Chamonix. Hugo Zhang sent me a couple of Chamonix 5x7 holders for evaluation. After examining them (including disassembly to confirm double light traps) and making some pictures with them, I concluded they are the finest sheet film holders made today. They are exquisite in both form and function, besting even my Lotus holders. As a result, I ordered 14 Chamonix 6 1/2 x 8 1/2 holders, and will probably purchase some in 5x7 too when my finances recover.I just received a dozen new Shen Hao holders a week ago. After examining them closely I am a quite disappointed in them...
Seems like problems come up no matter how simple the solution. I sent the Shen Hao holders back to Badger without a hitch. Jeff is a great guy and made no fuss about refund. I deceided to buy some more older wood holders and take my chances and rebuild the ones I could. I discovered Eastman holders could easily be rebuilt if needed so I purchased a quantity of them to find they won't seat in my Canham. The ridge on the holder is about 1/16" nearer the slide side of the holder. The Canham tolerences are much tighter in this regard than my Sinar and they simply won't seat. It looks like I will need to get the groove in the trap enlarged about 1/16" amd then they will work.
If I were you I would look for a back to use with the Eastman Holders as by enlarging the the light trap could cause light leaks!
Gordon
The older wooden 5x7 holders can work just fine. I have and use plenty of them, and sometimes I have to rebuild them, including putting in new felt for the traps, but with a putty knife one can usually pry up the wood surrounding that end of the holder and then glue it back in place. The old glue often will let go with very little pressure. Also, some brands of older 5x7 holders had metal plates retained with screws over the light traps, rather than glued wood. On older Agfa-Ansco holders the light trap felt and spring metal centers are removable from the end of the film holder by removing two screws. You can gently pry the whole thing out, replace the felt, then work it back in.
Scratching my head trying to figure out which virus rides along inside every wooden holder? Aren't the new ones from Shen wood? You'd think they carried Leprosy. Since 5X7 holders are now nearly extinct I'll happily trade 5 5X7 holders for 2 6 1/2 X 8 1/2 FILM holders. Wood is OK.
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