Spot Welding Question

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I need to modify the Tips on my Spot welder for a little project.  To enable spotwelding in a few, tight  space areas. The tip of one arm must be reduced to allow access to the inside section.Question is , what, if any difference, will that cause to the welding performance.    Should both tips be altered to maintain equality of size, or is it ok to have one "fat" tip and one "skinny" tip.  Thanks folks.
Reply:Could cause the "skinny" tip to self destruct prematurely.  You're completing a circuit with the tips.  Miller has a resource for Resistance Welding, a handbook.  Might find your answer there.Would it be possible to enlarge the entrance for the one tip, then close it again?
Reply:reducing just one tip is ok--but you'll have more heat on that tip,so you'll get a little deeper depression on that side. to weld body panels like hoods,doors and deck lids,we would put a flat copper bar on the finished surface and a regular tip on the inside surface. you dont get as strong a weld doing this.but you'll have a ttip on each side,so it'll be ok.
Reply:Thanks guys,Just finished modifying one the tips.  Hotter that side for sure.  Couldn't open the job up as the other side was a closed bent section. I'll check out the Miller info. for sure though and get myself a couple of tips for inventory.Thanks again.Oh, almost forgot, any idea what would be a good weld through adhesive to use where you can't use clamping ??Thanks.