I'm doing a similar job right now. I drilled the toothpicks out with 1/8" drill bit. fitted 1/32" plywood into the existing slots and glued with thin CA, then pinned wth 1/8" dowel. In my case the eleveator leading edge is 3/8" thick and I was trying to restore some of the origianl strength as removing the old hinges left a slot larger than I was will to accept.