The common heavy cast-iron sleeves, which are much used for axles, are- exceedingly clumsy, so that many prefer to use the wooden axle alone, while others are made entirely of iron. A contrivance to obviate this defect has been made ' by Thomas Mills, of Clearfield, Pa., who has taken measures to secure a patent. The invention is intended to introduce the use ofa: sleeve or tube made ot light wrought-iron plate, which gradually tapers so as to it on the tapering end of the spindle to which it is bolted. A shoulder collar, with two straps, fits tightly on this sleeve, and serves also as a shoulder for the axle to which it is secured by a screw bolt and nut. This arrangement materially strengthens and braces the spindle. The sleeve is made by cutting a thin piece of boiler plate to the proper size and shape, and then, after heating it, passing the plate between three tapering rollers, one of which is adjustable. The edges of the tube are afterwards brazed together, a couple of rin being employed to secure it from openicg during the process.