Assertion: tripod's base | /r/CapableOf | prevent the head
Facets:
value: from unscrewing
type: TRANSITIVE-OBJECT
value: during use
type: TEMPORAL
Source sentences:
text: Often the head will have a fairly large, flat base that sits on top of the tripod, and uses cork or rubber to increase the friction between the two, to prevent the head from unscrewing during use.