Thanks for the replies.
The physics model fits it ok when I look at the wire. I deleted the phy file so it could generate a new one which it did (but was the same anyway based on the low LOD).
Collision type is 1 and mass is 1. I keep pressing play and pause but doesn't seem to work unfortunately.
Am I missing a physics config file or something? I did a fresh install of 2.28 which seems to have a lot less files. I have a lot of problems with sandbox actually

It's a shame because I love the idea of a bunch of tools for a dev pipeline which lets face it, you're gonna need if you actually make something substantial. Maybe it's just me

Havin bad luck lately lol >< Had so many problems with max and photoshop and everything added up.
Oh another thing... is the water no longer in 2.28? Something you're meant to do with the waterplane?
Anyway cheers for any help:)