Originally Posted by
JanMM
With our recumbent tandem, chain tension is controlled by adjusting the position of an idler. Much simpler/easier.
Not really the issue, 'centering' is a completely different beast from 'chain slack removal'. An idler system or an eccentric BB only address the chain slack. Like others we have noticed a degree of cyclic increase/decrease in timing chain tension which could likely be reduced/eliminated by either Sheldon's or the o.p.'s centering procedure but... I haven't bothered. Hasn't been an issue. FWIW.
H