This rail attachment thingy I bought from sight-mount.com strongly suggest me to find a gunsmith to drill and tap the 3rd screw hole on my Glock slide (after attaching it to the dovetail rear sight) in order to properly secure it. I live in the greater Vancouver area so I would prefer not having to mail this out for the process so this must be done locally. Is it possible to have it done while I am waiting for it? And how much would this cost? I don't really know any one who can do this so I would really really really appreciate if I can get a quote and time estimate. You can reply here or PM me if you can help me out. Not in a hurry to this done so if someone can do this but busy please let me know when would be a good time for you.