my new denford microrouter has a porter cable 86902 23k spindle in it.

it looks like portable cable make about 3 different size collets for it, which is rubbish.

the nut thread is 1.25mm, when I put my callipers across the thread I get 24.8mm. so im guessing its a 25x1.25mm thread.

been struggling to find information on ER collect nuts, anyone know if one would fit?