Enjoyed your story sram...Keep them coming, and well done for sticking with your Monster.
Hatchback, you're right to be careful with the plastic nut, they can crack.
There are a few ways around getting a metal sender nut...I found these threads on the subject, with some useful tips and links....They are very old threads though so some of the info may be out of date.
http://www.ukmonster.co.uk/monster/s...archid=2585457
I happen to have a couple of plastic nuts spare, if that's any help?...