Yes to a boss, which Motolita can supply. This firm also makes the original style woodrim wheels, of which there were two patterns. The first is the straight spoke 'Derrington' wheel, offered as an option on Aces and Acecas I'd say up to late 1957. The second pattern is similar but it differs in that it has spokes that gently curve where they meet the centre of the wheel. Both types are available in 15" or 16" diameters, but the latter size is the the original (and more comfortable to use, although IMO neither of them beat the original Bluemels for long distance touring.) Tim