A solid piece of wood may well have been used and pressed in a steamed press.
Single piece ends seem to eventually fail with time, shrinkage, misuse, etc - many seem to now require replacement.
There is obviously much more detail to my description above - but I've outlined the process I've used.
The TT ends originally had a thicker core with thinner veneers on the outer faces. A multi-ply laminate is much stronger though.
I've made both raised and flat ends using the above process (here's a link to bass for which I made new ends, and link to pictures).
Choice of glues: I've used cascamine and liquid hide glue - liquid hide glue is much better, controllable and has a longer open time allowing adjustment of the laminate layers before pressing. And I believe cascamine is hazardous, so a mask is recommended when cutting the frets.
Here's a link to my nipping prress.
Edited by SteveS, 26 June 2016 - 10:56 AM.