The DL drill jig is the same as the DA 50; that's what I use with my drill press.
If you want to do your own drilling, get the DA 50 "PSP"-brand Drill Jig from Troy Built Models.
Troy Built will also pre-drill props; check their website.
Tom Denney at Valley View RC http://www.valleyviewrc.com/ also can do it, and he carries Xoar props, which are just fine.
Bob Kramer at DL-USA probably can also pre-drill for the DL 50 ... drop him a line at www.dlusa.com