Vantage does NOT need any more bolts.... aaarghh grid bolting is bad...
Ok, the best thing is a hammer and hand drill!!! It will make you appreciate each and every bolt you put in, so you will not put too many in. Plus it will keep you in shape
I can just feel the wave of bolt vs. no-bolt arguments coming... be prepared, and always remember do NOT bolt cracks, or other features that can accept natural protection. Do that, and not too many people on here will get pissed off at you.