I had a new "easy-up" fitted by the factory in December. Mark at the factory suggested that I left it up, initially for a couple of weeks and then (where possible) leave the car with the hood up when parked in the garage.
ps The fit and finish of the new hood is fantastic; and they also added some dark red piping to match the car - lovely.
Bud
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2003 - 4/4
Triumph Bonneville