While recently looking at photos of a new 4003 online, I noticed how smoothly the back of the neck flowed into the headstock. On my old 4001 (1978), the back of the neck, coming down from the headstock, is flat almost half way to the first fret. Somewhere along the way, Rickenbacker must have changed their tooling, or method of manufacture of the neck. Does anyone have information on when the change would have occured? Or do I just happen to have a neck where the employee pulled the wood away from the neck shaper about a 1/2 inch too soon? Seems unlikely, as both sides of the neck are shaped the same. This is not a complaint or jab at Rickenbacker, as I have loved these basses for over 35 years, just a question about subtle changes in construction over the years. Thank you for your input.