On Sun, 15 Jun 2014 07:44:04 +0100, Brian Gaff wrote:

It has been my experience that these tend to crack once o you put enough
force on them to turn them.I have found to my cost the only way to make
these actually usable is to remove them every year or so.
I assume some paind has not trickled into the thread, maybe some paint
softener might help.

I used these:

http://goo.gl/SXqlHA

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