Burgerman wrote:They will likely tap some red lester nicely. Other than that...
Burgerman wrote:I once actually drilled and countersunk a chocolate bar to show my female carer what a countersinking bit was for that just arived by amazon. So the screw fitted with the head flush. Because you dont need a powerdrill on chocolat. And she ate it.
A drill bit, and one of these: https://media.rs-online.com/t_large/F0218573-01.jpg
An 82° countersink angle is compatible with the profile of flat- and oval-head inch screws; a 90° countersink angle is compatible with the profile of flat- and oval-head metric screws
The 100°, 110°, or 120° countersink angle is compatible with the profile of rivets.
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