Interesting problems: ours is actually that the seat belt retract is too effective in service and won’t let go.
With regards to tonneau covers (sorry for thread drift), the original owner of the car had made a bespoke fancy cover with bits of spacer wood that went over the side edges (his drawings for the trimmers are in the car’s paperwork). This was in Everflex, but the subsequent new mohair roof was probably more bulky than the original and there was no way that either the previous owner or I was able to get it on. I also resent carrying a load of extra stuff in the car when it already has little stowage space, whilst it would be nice to be able to cover the back seats and ‘loose’ stuff behind a cover incorporating the roof material.
There are some residudal press stud fittings along the side at the top of the bodywork behind the doors, which gave rise to a cunning plan. So I fitted some mating press studs to the inner skin of the roof mohair sides, with the intention of seeing if the roof could act as partial tonneau for the back seats (folded down). It sort of works, with the easy-up hood bar rolled up behind the front seats, but is not supported. These poppers are subsequently not strong enough to take the tension of the roof fabric. I therefore have on order some button lift fasteners to replace them. Assuming that these hold the roof material OK, then I have a further cunning plan to support the anterior part of the rolled up roof and make it look reasonably neat. It might also serve to reduce neck drafts.
Watch this space....
Tim
