hi mate, thanks for your reply, yep defiantly missing on one of the two I've ended up with and while I agree its probably cheaper to buy a good version it always seems a shame to get rid of a camera that's otherwise good. tbh ive taken the red widow out of the 16/20 and put it in the 12/20 as the bellows seems fine on that one but the red plastic is a bit scratched anyway and would be good to replace on bothAre you sure the 'little red window material' is actually missing? Sometimes it comes free and slides beneath the metal sliding hatch door and hides in there, just giving the impression it's vanished! I don't think the bellows on the 1950s Ensign cameras are particularly prone to 'age related' light leaks, unless they get damaged by something. I believe replacement bellows can be bought/made to order, but I'd think it would be more cost-effective to buy a 'good example' of the chosen camera in the first place, rather than to replace the bellows on a damaged one?
For bellows, I've not used them but have met people who recommend http://www.custombellows.co.uk
I doubt it's a cheap option though, as @Mr Badger said it could be cheaper to get a "good" copy of the camera
cool thank you. do you think this is ok
https://www.amazon.co.uk/gp/product/B00Y0V9ZLU/ref=ox_sc_act_title_1?smid=AXJLU7T6LT8E6&psc=1