Am I going crazy or are VPro dimmers threaded differently?

[strider6]

Today I was in a house where we need to change all the dimmer modules since the old ones are triac dimmers and so flickering the new LED lights.

There's about 50 to change, all for new VPro Smart Multi Way (with the companions) and Standard 120w modules.

Unfortunately the house is filled with expensive screwless clear switches (similar to Wandsworth crystal) which have custom nuts for the knobs that then the nuts for attaching the front plate fit to, which means I can't use the nuts the new dimmers come with.

But these don't thread on the new modules properly? They do thread on other modules I have in the van, so do vpro modules really have a different thread pitch to everyone else? And would anyone know why? Normally not an issue but I often have to deal with overpriced designer switches like corston / wandsworth / buster + punch and this does end up a problem.

I managed to make it work by threading the new on first and then the old one (which partially threads on but not all the way) but it's not great.

 

[Pretty Mouth]

Yeah, they certainly have a different thread to some, but maybe not all, other modules. Never been a problem for me as I've just been able to use the v-pro nut.

 

[Simon47]

They are 10mm×1 thread - which I think is an uncommon thread to find on switches etc.
One of the things on my list is finishing the speed switch for the fan in the lounge. I did buy Fantasia's speed control, but the physical arrangement is not conducive to transplanting it into the Varilight grid.
Anyway, whether I use that, or as I plan, copy it but with the caps separate from the switch - I have the issue that the switch is 3/8" x 32tpi but the special nut to fit the Varilight grid module is M10.
So I've bought an M10 die and a 3/8 tap so I can see which works best - rethreading the switch I've bought, or rethreading the Varilight nut.