replacing leg elastic in BG Elementals
 

I have several BGE that are still quite absorbant, just a few holes, good PUL, but the back and leg elastic is starting to go, having some leaks. I bought them all used, and hope to get alot more life out them. Can someone give me pointers on replacing the elastic, or know someone who can do it at a reasonable price? I can't find a single tutorial for the elementals, and they don't have the usual casing structure. TIA.