Double Release Failure

We lost Captain Curt in Blairstown to a tug upset. Preferring to
stay away from that possibility. I have done quite a few landings on
tow and would gladly do one in about anything I'm familiar with.
Perhaps people who believe that landings on tow are dangerous haven't
done one?
After one LOT in an AS-K21 (during my Commercial check ride prep
with the instructor in the back seat) with tension still on the rope,
the rope would not release from the glider. It turned out the ring was
smaller diameter than standard and the release didn't open enough to
go past center. It would have released in flight, but sitting still it
wouldn't. How far from an in-flight problem was that? New Tost rings
were ordered, and the release cable adjusted.
Jim