Posted: 06/06/2017 at 14:27
Dig it up, discard it, and get another one.... probably get a half decent one from Aldi or similar for £2.. and put it down to experience...this one you have isn't worth bothering with I think...
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That would be my assessment as well.
I googled STAX, it looked like a trade only builders merchant so maybe not the right STAX