Hi Sniggly;
As you so kindly offered advice to me, I will offer my two cents here.
When I first start a guitar, I lay out the whole instrument on paper, poster board or a clean area on a work bench (I can't find one anymore). Just to get the neck angle and bridge height roughed in. Assuming this will be a pinned bridge guitar, and you have the neck joint surface at the correct angle and surfaced flat (being that it is now a bolt-on), also making sure the surface of the body is on an even plane and flat, (sides meeting are even not one side higher than the other, sand or scrape even if needed). With the truss rod, I typically route a channel a little deeper than the height of the truss rod, (1/32") with enough angle downward (toward the body) to clear the soundboard thickness and enter the head spar brace about middle way. Sometimes I cut out the top and run the truss rod at less angle. Depends on the instrument. I then drill two small holes centered in the neck block of the guitar where I want the bolts to go. Clamp the neck to the guitar in the position it will mount, you might have to make up some blocks , wedges etc..to help hold it secure long enough to reach inside and mark the cooresponding holes in the neck. Makes sure you have the neck mated very closely to the guitar at this point. Any additional scraping or sanding will cause a poor seat. Remove the neck and drill for inserts. Inserts installed, drill the body holes tight enough to retain the bolts so as not to have them fall out on there own. I like to thread them into the neck block with just my fingers. Re-attach the neck and tighten the bolts, check the neck angle and plane alignment (with the soundboard) as well center line of the guitar. At this point you should be able to tell what the height of the bridge will need to be as well as truss rod clearance and heel carving. You can make some adjustments if needed by removing neck material. On a dread with a flat area at the neck this should be rather easy to get a nice fitting purchase. What I usually do at this point is finish the fret board, frets included, Depending on your edge binding and/or purfling you may have to attach the fret board before fretting. Either way, after your truss rod filler piece is glued in and dried I take small hand plane and plane away the excess filler, being very careful not to slide off to the sides and scar the neck/fingerboard surface, it will show later if you do. It is very important that the neck be as flat as possible on top. I run mine through a 6 ft jointer to insure uniformity before ever cutting the head stock angle off. So if you have a high spot, even in the truss rod itself, use a 1/2" thick block wrapped in emory cloth to sand away the high spot on the truss rod, again being careful not to make marks in the neck edges on top. Now, you should be ready to start carving your neck and heel. after all that is done you should have a very nicely fitting bolt-on neck. Again, this is how I do a bolt-on, so it is just one opinion. I probably left some things out,so feel free to PM me for any further questions. If you find this helpful. N.C.
_________________ Nehemiah Covey www.coveysacoustics.com
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