[Healeys] Shaken...

[Oudesluys]

Check for a broken spoke or lost balance weight. It can also be caused 
by a damaged tire or deteriorated tire. How old are they? When older 
than 8 years you may have sudden delamination.
For the rest just check all the usual suspension items although these 
will be less likely causes as the shaking started all af a sudden.
Kees Oudesluijs

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