Originally Posted by langolier
How about buying some threaded stock that will fit thru the axle slots (3/8" ?) along with 2 nuts and 2 washers. Place the thread stock thru the axle with the nuts and washers INSIDE of the frame and start screwing outward to spread. It's the cheapest and simplest way I can think of.
Update: perhaps I misunderstood, this would be only for spreading the rear axle area not a specific area of the frame.
Still... there may be something to that for certain builds. Way to use your nugget!