Yep Neil, clecos are the best. I have a box full of em in my welding cart sheetmetal drawer. Button type, and draw wingnut type. Button type are only $4.50 a dozen might as well have a few dozen of each size at that price. I find the #40 drill clecos the most useful as it's easier to tack weld over those holes when done. I get them from aircraft tool supply places such as www.browntool.com , or www.theyardstore.com