"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
. 3.70:

I've got a machine that must keep constant tension on a stretchy roving.



I should have added (my current byline these days) that so far, this is a
completely mechanical machine. I could do this with a servo motor takeup
and a tension arm, like an old computer tape deck, but I'd like to not
modify it that much. The existing clutch is co-axial on the takeup spool
shaft.

LLoyd