The pull cord switch for the shower stopped working last night and on
opening up I discovered that the live terminal had burnt and the
switch damaged. I understand that the likely reason for this is that
the connection might have been a bit loose leading to higher
resistance etc.

Anyway I am about to go up into the loft to see if there is any slack
in the cable. Otherwise I think I am going to have to crimp a section
in. I don't have any heat shrink sleeving at the moment and, looking
online, the only place I can see that is open and I can get to only
has up to 13mm sleeving. I don't think this will be big enough for 6mm
cable. Or might it be? Are there any alternatives to heat shrink
sleeve that might be more available?

Thanks,

Bob