welding clay, hold objects so to tack

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I've got some applications where I need a coupling nut to stay put on a bike frame so to weld it, any product or trick for holding it in place (it must be vertical, cannot lay it down), something like a tacky clay?
Reply:Magnet.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:I  thought of a magnet, this spot is really tight without a decent flat surface
Reply:Articulated jig.---Meltedmetal
Reply:Hold it with your fingers to tack it?Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Originally Posted by SquirmyPugHold it with your fingers to tack it?
Reply:Originally Posted by weldermikeYup, put a bolt in the nut and hold the bolt.
Reply:I have done something like that lots of times. Always used a bolt and my other hand to hold the nut and protect the threads from spatter.
Reply:Yep, a bolt works well.  I always anti seize the bolt so it doesn't gall the threads when backing it out.  Just to be safe, never had a problem doing it this way.RogerOld, Tired, and GRUMPYSalesman will call, Batteries not included, Assembly is required, and FREE ADVICE IS WORTH EXACTLY WHAT YOU PAY FOR IT!Dial Arc 250HFThunderbolt 225 AC/DCAssorted A/O torches
Reply:In addition to what others have said, a small piece of copper tube, bent and pressed to a point (doesn't have to look pretty) works as a "weldor's finger".  It's a home made tool used to hold small items down that need to be tacked up.  You can bring the "finger" close to the arc and because it's cooper, it won't stick or fuse to your welding project. "Hey I didn't come to look and learn, I came to turn and burn.... If I can't light up, I'm gonna light out!"-JodyIdealarc 250 "Fatman"MM 252MM 211 "Little boy" Victor Torches