Safe to “second hack” a vintage 861

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Sorry if this has already been asked, but is it safe to “second hack” a 861 caliber from 1991?
 
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Yes.
Is this with the provision that it doesn't run backwards as that would damage the pallet fork? I seem to recall reading something like that.
 
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Is this with the provision that it doesn't run backwards as that would damage the pallet fork? I seem to recall reading something like that.

Yes.
 
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is it safe to “second hack” a 861 caliber from 1991?
Sure, but why? Does it really matter if you are 20secs. fast or slow? Is you daily schedule that tight? A man with more than watch never really knows what time it is anyway.