Hoover Turbomaster carpet/hard floor selection not working

[nswsteve]

Hi,

I've acquired a Hoover Turbomaster total system U5094. Unfortunately it seems to be only working on hard floor mode. The selector foot switch doesn't work and on opening her up the pin system that engages/dis engages the belt from the pulley is missing. the white and black part that the belt goes around both move freely of each other so the brush roll isn't being turned.

Any ideas how I might fix this?

thanks