Jacques, I used the 17/64 drill and tried a tap which didn't feel good, so tried another which felt somewhat better. I tapped 8 holes. It worked but will plan to buy a 6.8mm bit at some point in the future.
In N.Z. Patience and Nicholson make drill bits. I think they are an off shoot of the Australian drill maker (lost the name for the moment) anyhow the put out some very good charts: one a tap-drill chart and the other a drill selection chart. together very useful.
There are some horrible and useless drill bits on the market these days.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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