I presume you are talking about a Randall 102 or 103

Better to buy the electronic equivalent e.g. Randall 105E, no need to
rewire anything and it

Too true Maxie, also the ubiquitous Landis & Gyr mechanical version has a
direct replacement digital model.



For those of us with a bit of relevant experience,

"The problem is that it's very old and the plastic knobs just get
pushed around the dial so the heating wither stays on, or stays off
depending on which knob actually managed to switch it last."

gives it away as being a 102 or a 103. The direct backplate compatible
replacement is the 103E or the 105E

To replace it with any other make would involve replacing the backplate
and rewiring it

listen and learn



--
geoff