it's the lignin in the wood that does the deterioration. Thats why they use non-lignin paper to mount photographs in albulms for long term storage. Seems to me that just about anything synthetic would be better long-term, but preformance is another matter. I have used insulated wire in the past for repairs and the last one I did , I used it for a whole set. Easy to use and cut and will stay in the slot with friction a lot easier and better. Just burnish it to get straight and cut it to exact length, press into the slot with a duckbill parrallel pleir and set the spring. What I have used lately to repair grand repetition spring cords is Gosling thread. It is a woven synthetic cord and is available at a fabric or sewing supply store. It sells for about 25 cents a yard,and is heavy enough to work with easily. Theodore Mamel RPT Pittsburgh Chapter
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