Just a follow up on this for anyone else that hasn't got to this point .. not as bad as it sounds .. while it seemed like it took us a 10 hours to file the stops to spec, from start to finish was about an hour and a half and it's perfect. We just used a large file and a digital pitch gauge. File, refit, measure, repeat, etc. You do have to remove the linkage to easily get to the bottom stop.
#140376 RV-14A QB IO-390 Thunderbolt