Hi Phil,
It should be pretty easy to get the baffle bolt out through the hole underneath... I think it's a 4mm Allen key (need to double check that though). Another silly question....you did pop the rubber bung out didn't you??
Unless you're going on a 2000 mile Euro trip, just add a few PSI to the rear tyre and remember you have a passenger on the back when the temptation fairies start whispering in your ear
Cheers
Rick