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Explanation: olivetta is a toggle, the basic meaning of which is as follows:
toggle - definition of toggle by the Free Online Dictionary [www.thefreedictionary.com/toggle ]...
... rod fixed crosswise through an eye at the end of a rope, chain, or cable, for fastening ... toggle - any instruction that works first one way and then the other; it turns something ...
If during mounting it is necessary to have safety chains, with a kind of provisional fixation, then it seems logical that one should check how secure these are.
More context would have helped
rcolin Local time: 04:26 Specializes in field Native speaker of: French, English PRO pts in category: 84