The Uk Vapours forum has a thread showing people how to put a new o ring in (some of the first version were shorting at the 510 connector) so it shouldn't be to hard to fix it for yourself.
DV menthol is just menthol crystals doesn't have any of the mint or tobacco background that other menthol flavours often have.
CBA with all that to be honest. I did look around for a replacement base, saw a few US sites selling them, the only UK stockist was out of stock so i just ordered a couple more. Shall keep the old one for spares though.