iirc a guy on the yahoo 75/ZT forum has something similar In the event it turned out to be something plastic (and cheap) on top of the engine.
Here's the link to it though if you're not a member then you'll need to join to see it.
yahoo group
hth
Mike
Here's the link to it though if you're not a member then you'll need to join to see it.
yahoo group
hth
Mike