As Joe Carroll said, the obvious spots for the problem to develop are the mesh screen or the starter cup touching something stationary. I notice some odd shiny spots on the top of the cup:
[Linked Image]

One of Joe's suggestions was that the top of the cup might be touching the underside of the rope pulley. I may be missing something, but at the moment I don't see why the top of the cup is so shiny unless it is touching something while rotating.

We can't see the outside of the flywheel in the picture supplied. Note that there must be clearance - about the thickness of a business card - between the flywheel and the ignition module. If the flywheel has been touching the module there will be shiny or scratched areas on the outside of the flywheel. I haven't heard one screech, but it may be possible.

Last edited by grumpy; 05/07/12 11:45 AM. Reason: Add another possible cause.