why don't you want to stretch the frame? if it's 110 spacing i'm assuming it steel, correct. you don't need to cold set the frame, just pull apart slightly when you put the wheel on.
when shimano came out with 8 speed in '89 or '90, the dropout spacing went from 126 to 130 mm for the extra cog. their early hubs had a tapered nut on one end to make it slide in more easily on older frames since 126 was still the standard dropout spacing.