http://www.youtube.com/watch?v=CxsTTU0zLdI
piece of cake. first time, take all the time you need. not a race. thereafter,
about 5 mins. those rear regulators are a weak point in 210s. fortunately,
they're relatively easy to replace.
usually, it's the little white nylon square fitting which fractures. if that is all,
it can be swapped out for about $10, though a little labor involved. otherwise
replace the whole unit, sans motor.