I was able to get a heavier string from my local "Fabric Land" the ladies were very helpful. Re-stringing the blinds is not hard, just need to pay attention to the route of the string.
I charge RV'ers with broken day/night shades $25.00 for small 2 string blinds and $50.00 for the larger 4 string ones, that includes re/re..! I noticed your a little far away from me....lol.
Glen & Robyn (A.K.A. Puff & Crickit) Full Timers..
2006 F350 6.0 with 3.73 gears, 4X4, Extra-Cab Long Box, Oil/Tranny/P.S. Coolers. Coolant filter. SCT Livewire.
2011 Cedar Creek 36RE, Auto levelers + too much to list..!