Cowells Milling Machine Speed Control (NOT working).   This control box came from an early design Cowells milling machine. Visual inspection of the circuit board shows two capacitors that are badly damaged and obviously in need of replacement (see pictures). The design of the circuit looks very similar to a Kenwood Chef food processor for which a repair kit can be obtained on eBay for a few quid so, if you need one of these controllers, it would be worth having a go at fixing it.