I would suggest that is "stress corrosion" of the stainless hinge.
Caused by road salt and wrong choice of alloy. (I used to work for a
company that made stainless steel)
Graham
Roger Anderson wrote:
> Further to my recent e-mail regarding the condition of the lower flange
> of the hinge on my mono trailer I attach herewith a photograph of the
> flange.
> Owing to the proximity of the hinge to the ground it can only been seen
> using an inspection mirror.
> Roger Anderson (G-BXTD)
>
> ------------------------------------------------------------------------
>
--
Graham Singleton
Tel: +441629820187
Mob: +447739582005
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