A lot of people use Henrys, so here's a bit of useful information. If you have the one with the windable lead, if it ever breaks down, there's a good chance it's a terminal broken off. These terminals are easy to see, they bear on the brass rings of the winder mechanism, and unless they've changed recently were riveted - but the replacements are only a few quid, and they bolt in, so just drill the rivets out of the old ones.
boom boom!