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When to use fixed or floating blind nuts?

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Dances_with_cumulus

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i have drilled 1/8th inch holes and have all sheet metal panels cut and held in place with Clecos. Now I have a choice to make- which blind nuts to install. Is there a rule of thumb for where floating versus fixed blind nuts should be used? For example should one type be used where there are no overlapping panels and another where there is? When the clecos are removed and drilled out for the actual screw, the bit will seek to center itself in a rigid blind nut, which will bias the hole to where it should be. That self centering may be less likely if a floating nut is used because the bit tip can wander. Suggestions appreciated! Thanks
 

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