It's a bit odd but I've already held the part in place with my left hand and did a quick tack weld with the right. A few of them will do the job.
I don't even bother with the welding helmet. I just close my eyes for that job. LOL
I've already used masking tape to help hold a part in place until I tacked it but probably wouldn't work well on the cab corner.
They sell magnets to help hold the part too. That might work.
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63 Impala*66 Chevelle SS*69 Chevelle*69 C10 Stepside*71 Cheyenne 20*72 Chevelle
Parts for sale:
http://www.angelfire.com/trek/mr409/items4sale.html