The base shot off yesterday (the stop nut had been left off )
Somehow this seems to have left one of the copper spring guide tubes (item 62 in the diagram) stuck-fast inside the case. These tubes have a lip on them, and I think it has stuck down the side of the plastic? moulding it is supposed to sit over. (and just my luck -its on the side of the case that has no hole at the top)
I've had no luck pulling it out from below so I've started dismantling the router. I figure removing the lower casting could give enough play to work the tube out.
However, I've now run into a snag removing the magnetic plastic tachometer wheel use by the speed controller from the end of the shaft so I can release the armature from the top bearing. It looks like the end of the armature shaft is grooved so I guess it's hammered on, and probably won't come off without breaking. (I think this might be part 98 the "pole piece" in the diagram; although if it is, it's shown in the wrong place)
I'm wondering if it would be any easier to remove the lower bearing or to split the thing and order a replacement.
I guess I may have to send it off for an expensive repair (of course we need to use it today).