This DIY 'repair' is holding now for more than 20 years...
I’ve not done a thorough analysis but the material used on my late-1960’s Rolllei appears synthetic. And I’m certain that it is the factory material.
I followed an internet recommendation for Lily, Sugar n Cream, Cotton Yarn. Black 0002 Made in Canada.
UK readers can find it at Hobbycraft.
A ball will last a life time, and it was reasonably priced.
Easier to use than foam, and if it needs replacing at a later date lifts out of the crevice with no troublesome adhesives to pick out.
Regarding today's foam sealing materials. Shouldn't these be more durable than the materials back then? The materials have been further developed.
The foam is made of some sort of petrochemical byproduct, if memory serves, and breaks down into a gooey mess given enough years.
So which chemicals are useful for removing the old adhesive?
1. Wear nitrile gloves/wear eye protection
2. Make sure you cover shutter curtains with a business card
3. Remove focusing screen/prism if possible
4. Cover mirror, if any, with soft material like a Pec Pad
5. First, remove the gross amount of gook with small stick cut into a wedge shape
5. Soak a Q-tip in naptha (lighter fluid) - make sure area is well ventilated - use that to remove the remaining crud.
6. Clean grooves and then generally in film compartment with Pec Pads dipped in ethanol or isopropyl alcohol.
7. A little adhesive left behind is ok. It will serve to hold the yarn in place
8. Pack the yarn into the grooves.
These instructions appear to be for an SLR. But you have to remember that the camera in question is a Yashica A TLR.
Nonetheless, most of this should work fine.
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