I don't know on ballpark (Ill see if I can remember to take a look the next time I see some shorter jumpers). I did this on a set of snow skis for the kids, saw it on a snow forum. Tear off a little steel wool, and push it down a bit in the hole with a tooth pick, then fill with epoxy (JBW). The steel wool gives future screws a bit more purchase.
I would bet if you chatted with D3 online, they would do you a solid and tell you their DFT.
I was chatting with them about some jumpers, ended up going with stokes, and they were still very gracious after I told them about my direction. I was on an email chain with T Whisper... very cool experience.