Right, time to order a DTI (don't shoot me, probably where I went wrong in the first place!). Should I go for lever or plunger type? Lever appears more expensive but if it's going to be more useful then I don't mind. I'm looking here: http://www.lawson-his.co.uk/precisio...ial-indicators

While I'm at it, is there any other piece of measurement equipment (straight edge etc.) that is worth buying for setting things up?

Cheers!!