Bearing witness to the fact that the lathe must have remained in production for a number of years - and sold in reasonable numbers -  were both the number of changes made to its specification in this Mk. 2 Model and then its continued manufacture as a Mk. 3 by  Rocky Mountain Steel
Alterations incorporated in the Mk. 2 included an increase in the centre height to just under 6-inches, a variety of longer beds, different stands (including a cast-iron version closed in at the front but open at the rear) and an altogether more fully-developed version with a proper compound slide rest with the cross-slide ways changed to a more modern V-type, the top-slide base graduated in degrees and a T-slot provided to hold a standard-type, lantern toolpost. Zeroing micrometer dials were fitted to the top slide, cross slide and carriage handwheel - with the latter featuring a vernier scale - a fitting seldom seen on even the most expensive toolroom lathes. The saddle-to-bed fit was adjustable by tapered gib strips and the unusual "carriage-gap support" was given a much more substantial bronze foot (rather than the bolt used on the early lathe). The leadscrew had a double start, left-hand Acme-form 2 t.p.i. thread..