Many here post about new bikes, speculate about new bikes. I've done both. Recently, I speculated about a possible new tandem.
Instead, I cleaned (deep cleaned) the 1995 Santana, fine-tuned the bar end shifters so they work (in friction mode) with new wheels and a new 9 speed cassette (all the way from Colorado), swapped all the cables for new slicker ones, put some india-rubber-like Koolstop pads on the tuned and adjusted cantilevers, and put new double padded bar tape on it, fine-tuned the captain and stoker geometry, and installed a grippy pair of 28 tyres.
And I no longer want a new one. I'm no longer irritated by out-of-true componentry, and am enjoying the bike as much as when it was new.
And, I'm enjoying that my leg (older story) is now strong enough to launch and land a tandem, and that stoker-in chief trusts me to captain. That's the fidelity part.
We're up to metrics already, after almost a year's lay-off from tandems!