Excellent!
Interesting, use of Baker gear. The original Juliet had inside Stephenson's Gear, but the smaller Tich was all outside with Baker Gear. I wonder why LBSC chose that – it is a modified Walschaerts, but the latter was much more common in British practice.
LBSC's original application of Stephenson's Link Motion to Juliet had a flaw. He guided the valve-spindle by a single-sided swinging-link working on a pin secured to the adjacent frame-plate – an arrangement susceptible to serious wear debilitating the loco in frequent use. Fitting trunk-guides on the frame-stretcher instead, will " teach it manners " , to use one of Lawrence's favourite phrases. (My club did that to its 7.25 " g version.)
I think K.N. Harris did similar among his modifications to LBSC's original valve-gear design for the 5" g. Maid of Kent.
I am not sure about the former engine, but I am pretty certain LBSC designed Tich with a slip-eccentric option. That's OK if you are using it on a continuous track but not very practical for up-and-down lines, and of course it doesn't offer the opportunity to drive it fully, combining regulator control with notching-up.
Since both designs were freelance, representing small industrial locomotives but not modelling a specific one, there's plenty of latitude. I wonder if the Mann [sliding-eccentric] Gear could be used on the inside-cylinder versions?
Edited By Nigel Graham 2 on 12/01/2021 22:40:12