Spreading a steel front fork
This to be done with caution and patience. I recently did it using a long 3/8" carriage bolt that I purchased from the hardware store. I placed a washer on the bolt screwed on two nuts then another washer. Install the bolt in the axle notch of the forks. slowly move the nuts outward gradually spreading the fork. I did it slowly over several hours although I don't know if it is really necessary. You will want to go 3mm-4mm wider than needed as the fork will spring back a little when the bolt is removed. You must also be aware that the old style forks do not have the recessed seat ( known by some as lawyer lips) to retain the skewer if it comes loose.