well, let's see. a hogshead *is a large cask, equal to four firkins or two kilderkins -- so that leads to c, f, and g.
and the Brits call a young sheep a hoggerel(?), I think until it's been first shorn, which leads directly to o. then you got your Harley, which leads to d and l.

have I covered all the armilsŪ?

actually, I have a stinking hunch it might actually be o. <cough>