Water ballast bag replacement surprise...

Today I pulled out the RIGHT-side water ballast bag from the wing of
my DG-300 (s/n 3E1). Before I began this I noted 3 strings sticking
out (two white, one yellow) and was prepared to attach a line to the
one that began to disappear into the wing as I removed the bag (this
string would be attached to the end of the replacement bag and used to
pull it back in).

Surprise! None of the strings was attached to the bag! The bag came
out without any strings tied to the end. The three strings that were
there before I removed the bag remained in place, presumably anchored
where they would normally be to secure the bags. (The LEFT-side had
the normal string arrangement, so I should be able to insert the left-
side replacement bag easily.)

How am I going to install the right-side replacement bag?

Because I saw no string (i.e., broken remenants) attached to the end
of the old bag, it seems that the old bag had somehow been inserted
without being pulled in with the normal string arrangement.
Possible? Also, the old bag seemed to stay in place without being
anchored (DG's manual say you should periodically check the string
tension to make sure the bags are held in place).

Any suggestions about how to get the replacement bag *in place* and
*secured* will be gratefully accepted!

Thanks,

Eric