yep they are bit hard to get to, helps to have a very steady hand, its like a game of operation but the only difference is your nose will glow bright red if you touch the wrong part.
the one i adjusted a few months ago bit me a couple of times, then i found the leak in the H.T. lead (you think I would have repaired it after the first zap but thats me), repaired it and then I could adjust them without getting a zap.