I can only speak for my truck, but it certainly should be retained on the pivot at the rear of the bell housing.
Certainly the rubber boot isn't going to help much.
My release arm has a forked flat spring that pops it into place.
Dave seems to have a good handle on the linkages of these mechanical clutches.
Perhaps he can respond with a pic or more succinct answer.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.