Timney’s work great in the M77 MKII and take about 15 min to install if I remember correctly. I don’t remember having to tweak anything on the Timney I installed years ago with no prior experience. I certainly wouldn’t pay anyone to do it.
I’ve also stoned/polished several down to a nice crisp 2.5-3lbs. Follow the directions online it ain’t that hard.
Having said that....If you think you’re going to screw it up working on it yourself, do it anyway. You might surprise yourself. If you do screw it up, just buy the Timney and put it in yourself...it’ll be perfect.
Best case: You gain some knowledge about how the trigger works and how to tune it. Worst case: You end up spending the money you would have paid a smith to work on it on a new Timney which will be as good or better than your smith could have done.
Just my thoughts,
Leftybolt
