u/GE315

First picture is of a bottom stringer(?) for a couch. The couch has coil springs, which are supported below (second picture) on hemp straps. These straps are held by (cut-) nails into the stringer shown. Over multiple strap replacements, the nails have degraded the stringer, to the point where I'm concerned about how well new nails will grip. Nailing is through the strap, so I can't tell where I am relative to the old nail holes/splits.

My question is whether there is a product that would repair the damage, so it would accept and hold new nails. Clamping doesn't close up the inboard holes.