Changing the rubber bits in a master cylinder isn't usually too complicated.
If it's anything like the average brake master cylinder, you remove the lever, remove a circlip, and pull the gubbins out, catching the fluid that'll spill. Then replace the rubber bits on the central shaft, replace it, replace the circlip, refill with fluid and bleed.
Have fun fettling :)
Not today, but last week I welded up yet another hole in the 2-1 section of the exhaust, brushed all the rust and winter cack off it, sprayed it black and baked it in the oven for an hour to cure the paint.
Tonight I am going to replace the reflector in the headlight as the silver coating seems to have burnt off! HID lights too bright, perhaps?
"When compared to other motorists attempting to escape a zombie outbreak, dirt bike riders have a 23-to-1 survival rate." - The Zombie Survival Guide by Max Brooks