i sew patches on leathers for friends every season- with my viking-
use the leather needle- a good 30-40 wt thread- top and bobbin.
lot's easier than you may imagine. :thumbup:
i started charging $15 a patch (thinking that would put them -off-'cause it's not my favorite thing to do ) but evidently that's a pretty fair price- they come to me with dozens of patches at a time....