basically, two questions: 1) I remember ages ago on C+ somebody posted a link to a video on youtube that showed some blokes trying to cut through bike chains with various tools, boltcroppers, angle grinders, etc. - I think they managed to get through them all within about 5 minutes (albeit after replacing many of the tools/blades) apart from one which either took ages or they couldn't do it - does anybody remember what that was or have the video? 2) is welding generally fairly secure? I can't see any reason why it wouldn't be, but just wondering if there's something I've completely overlooked...what i'm considering doing is having a ground anchor welded into the floor of my van. Does anybody know anything about welding, and whether it's likely to be possible / expensive ? If so, is the fact that the floor is painted white like the sides going to be a problem to a professional welder?