The "tic" involved is a periodic interval marking one side of the track you're on. Like a ball rolling down a chute.
"Tack" wouldn't have been any more appropriate. It's a very mixed metaphor, but it suits our royal pleasure.
Thanks for the correction. And if it suits your royal pleasure, then, by all means, use it royally, well and pleasurably!
Some days, my brain doesn’t function properly. And I really do like learning new things. So thanks for helping me learn something new. :o])