A very very long shot this, but I have one of these 70s Copydex
Jointmasters, a useful bit of kit which works well, but the plastic
inserts on the saw guides are, perhaps not surprisingly, worn away.
Does anyone have an old one of these they no longer use, so they could
let me have their inserts - assuming they're not worn away too, or
does anyone know where I could get them from otherwise?

TIA

Keith