Thank you, it's my fault for not being prepared and with such little shed time I was hoping my mistake would not be costly.
Many great answers and tips as usual.
Fathoming it out oneself is part of the fun and I do need to do more of that myself. I guess I'm of the google age. " don't think just ask" etc.
I think I shall invest in a range of drills and gauges then I will always have an option.
Cheers gentlemen.