Nuova Simonelli MDX Grinder Burrs common-universal-wega-parts/wega-steam-water-valves-pipes and R_455 acorn nut

and R_455 acorn nut

so you won't get a dramatic "this is broken" signal

this capacitor is almost always the fix - not the motor itself

If your brewer has a smaller funnel you may want to opt for the 12 1/2" x  4" filter size

Nuova Simonelli MDX Grinder Burrs common-universal-wega-parts/wega-steam-water-valves-pipes and R_455 acorn nutNuova Simonelli MDX Grinder Burr Set An after market 64mm burr set for the Nuova Simonelli MDX line and the Eureka grinders that share the same grinding chamber. Nuova Simonelli machines are built for durability and precision, and this burr set is machined to match that standard rather than cutting corners on hardness or edge geometry. SPECIFICATIONS 64 x 38 x 9mm, right hand rotation COMPATIBILITY Fits: Eureka MDLCA and MDMCA; Nuova Simonelli MDX,