As these instruments get older the neck is the most likely part to fail that cannot be easily repaired or replaced. Good replacement necks for T-40s are getting harder to find and more expensive. I've posted this in a couple of Peavey threads before but thought it would be easier for anyone searching for info to find as a separate thread. As best I know there is no direct replacement for a 20 fret, square heel T-40 neck. It appears to be unique. The easiest substitute I've found is a late model Peavey Milestone neck with the wheel at the heel truss rod adjustment. It's 20 frets but has a round heel and is a little too wide at the heel to fit in the T-40 pocket. It also has a 1 1/2" topnut, which was good for me. I believe the earlier model 20 fret Milestone necks with the TR adjustment at the peghead can easily be made to fit. They may just need to have the round heel sanded square to fit but haven't had one to try. If you have access to a band sander you can sand less than 1/32" off each side of the heel and then dress the end of the affected frets. Sand equal amounts from each side then try for fit. Repeat as necessary. (It is helpful to be familiar with the operation of the band sander and it's adjustments so the sides of the heel remain perpendicular to the seating surface of the neck heel.) Also remove a taste from the round end of the heel below the wheel so it fits farther in the pocket. New mounting holes have to be drilled in the neck. The old holes may or may not need to be plugged. Takes about 20-30 minutes. I seal the sanded areas with Tru-Oil since it is an easily applied clear finish. This one weighs 9lb. Tuner holes were enlarged for the Titans, TR cover is just for the look and the pinstripe is tape. I also have a black one done this way.