Hi Dene,the correct imperial dia drill bits are obtainable in S Africa from 
Engineering supply stores,not the local hardware stores.You dont need long bits 
as two standard size bits are used.using a simple jig and drilling from 
opposite sides to get a perfect match through the spar and WAFS on each 
side.The jigs for the mainspar and the dragspar are very easy to make and use 
and give excellent results.If you need any help ,contact me direct.
Best Regards,
Eric Evezard,
South Africa.

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