Tuners worn . . . Considering DIY with either manufacturer's machine tuners or better ratio secondary market. If no drilling is required, is this something that can be done on own after I watch several YT demos? The tuners have top nut/washer; the rear has single screw attachment. Professional job, or doable on own? Not sure how to match up, hole diameter, with secondary market tuners--no fine-measurement equipment. Manufacturer item would best match without issue, but not sure of original quality. I'm thinking, go with manufacturer part; it may not be best ratio but only way to have exact match. Thoughts, please--DIY or professional job. Thank you, Jeff Fletcher.