Gentlemen ,
Thank you for your replies, maybe I didn't explain myself clearly?
I really am paranoid about doing everything perfectly and my concern is all about boring the hole perfectly in line with the threaded hole in action .As you can appreciate this can vary in a number of degrees from being just a few degrees down from the axis of the bores to being anything up to 30 degrees or even more.
Any misalignment here can lead to the wood not being clamped correctly to the action.