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Old 1st Jun 2018, 8:35 pm   #2
emeritus
Dekatron
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: Correct Fastener ID

Not something I have come across. The closest is some types of decking screw that have a portion of left-hand thread adjacent the head, but the other end is ordinary have right hand woodscew thead.
You may find that the original screws will clean up nicely with a circular wire brush on a bench grinder or an electric drill such as a Dremel.
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