Re: schwinn frame help needed
Have you checked the year? You can do this by copying the serial# from the bottom bracket, and then googling it, I believe Sheldon Brown wrote a whole article on this, usually the letter, or first number denotes year, then mo.....
Point is, IS IT A CHICAGO SCHWINN, REAL STEEL OR CHINA BUNK?
EITHER WAY I WOULD SUGGEST GUSSETS AND OTHER STRUCTURAL SUPPORTS WELDED IN.
the stretching can be done cold with a piece of " 3/8" all thread" the appropriate nuts and a couple washers.
Put the nuts to the center of the all thread with the washers to the outside. Slip this into the rear dropouts, slide washers against dropouts, bring nuts to washers (he he) finger tight.
This is where I usually make up some cockamaimy scheme to measure and keep this all straight, HOWEVER, if you do an even amount of turns on either nut, it SHOULD keep spreading the frame evenly.
You will have to bend out aprox' 15-30* beyond your mark to account for "spring-back" or the "memory" of the steel.
...hope this helps, keep us posted, pm me if you have questions or contact one of the moderators....they're like Albert Bikestein's all knowing, and Yoda like.