The question for spare nylon pull-loops was asked only for those who can not or do not want to do something themselves.
Note 1: To mount a spare nylon pull-loop in the original way, the plug has to be removed (!). Of course, the pull-loop can be secured also in another way.
Note 2: The main reason that the original nylon pull-loops tear out is that they are pulled out at a too steep an angle instead of horizontallly.
I myself have found a very simple solution for a pull-loop (photos attached), applicable either as a replacement or together with a backup battery and therefore I will not buy any spare parts.
How to do it (see also photos below):
Cut a nylon thread (0.4 mm in diam. and about 30 cm in length)
Unscrew the connector housing by approx. 1 mm
Form a loop with the nylon thread, adjust the length of the loop so that the distance from the beginning of the plug to the end of the loop is max. 50 mm and fasten it with only 1 knot to the plug.
Note 3: The max. length of 50 mm allows to pull out the connector exactly horizontally.
Carefully tighten the connector housing
Take the two open ends of the nylon thread and wrap them together around the connector so that they fill up the gap and knot them with the loop (these knots come to lie outside the connector housing). Cut the 2 open ends to a length of 3-4 mm.