Post by PICTUP on Aug 16, 2016 16:04:01 GMT -8
Lots of good advice here already Tom. You should be able to do it yourself with great results, especially if all you have to do is drill threads and tap new ones(for the coil). I find the easiest way is to drill out progressively bigger holes until you are just undersized to the drill for the new coil, that way you have a better chance of getting it in there square to the face. When tapping, watch that you don't get it off kilter, use some cutting fluid, and take your time, backing off every 1/4 to 3/4 turn or so, so that the metal you are cutting out doesn't start to bind and gall the newly cut threads. Sometimes this requires taking the tap out, brushing it off and maybe even cleaning out the hole the best you can. Thread it back in with a light touch to allow it to follow your new threads. 
