[Tigers] Soft top storage Bands?

[Robert Jaarsma]

An item I do not know its exact placement for or it's usage: (2)
rubberized canvas bands with a Tenax push button on one end, a hook in
the middle and a small piece of metal with two rivets. Does it holds up
the top or the top cover used in the Mk1A and MkII? Not used in MkI? How
is it supposed to work? I vaguely remember it something to do also with
the hardtop?
My band is so bad, if I were to stretch it, it would crumble in pieces.
I could not find it in the parts books I have. Somebody must know!
Robert