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I have pick up a pack of heilcoils to fix a screw on my speed four and just have some questions if anyone can help, it says 1/4" (6.3mm) drill size for the hole, do i use a 1/4 for the tap or something bigger/smaller? Thanks for any help.
 

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If you don't know what you're doing using a Helicoil wrong can be a path to an expensive repair.

IIRC with a simple Helicoil Kit you drill the hole to the specified drill size, then use the Helicoil tap, then use the tool to insert the Helicoil.
 

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Indeed. Helicoil taps are 'specials'. You need to purchase the correct helicoil tap, and usually also the drill.
 
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