Thanks to Ian & Brion for your responses.
I didn't have an operational problem, it was more conceptual. I didn't understand what held the traveler car still when the windward line was unclutched. I didn't appreciate the vertical force involved. My boat, a Catalina 36 MKII has a 6:1 purchase on the car and it is not a problem to move the car in either direction.
I understand now. Thanx. May the force be with you. Ed
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