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When making up the sierra the drill needed is 27/64 I found this to be a bit loose had to use too much epoxy so I tried a 10.6mm works great with ca
nice and snug
Particularly with Sierra's it always pays to measure tubes first.
In fact make a habit of it with every kit.
An age old debate is the size of Sierra tubes and one I have argued many times so I won't go there now.