@Bruce Brown posted:
The major challenge was keeping the ends of the three rails in perfect alignment if the curved track's radius slightly changed during handling process.
Fun fact, in order to close the gaps on the first end, just tap the other end of each rail until you close the gap. For the second end, it usually takes a bit of trimming with the Dremel to get them aligned for the next piece. Even then, that's where I sometimes got gaps, I didn't take the extra care to make those perfect.