Capons,
Can you tell us about the tool you used? This procedure is what I found online dating back 100 years, so I know its the way its done. You didn't mention about making the incision between the 3rd to last and 2nd to last ribs, which is where the testes should be found (I think, please confirm!). I too am curious about how fast the cut heals, but I also know that nature likes clean cuts and heals them up pretty fast.
It wasn't clear to me, but you took both testes from the one incision, right?
Cheers,
Russ