</gallery>
==References==
{{Ref|Ewing 2007}}
{{Ref|Graham-Campbell 1980}}
{{Ref|Owen & Dalland 1999}}
{{Ref|Paulsen 1933}}
{{Ref|Petersen 1928}}
{{Ref|Roesdahl 1982}}
{{Ref|Roesdahl & Wilson 1992}}
{{Ref|Rundkvist 2010}}
<HarvardReferences />
[[Category:Fastenings]]