See the post" Shortening the Monark springer " under the
project bikes thread posted on 10/31/ 15.
This is the most precise way to straighten any fork. It straightens the fork within the confines of your bikes headtube. Evenly applying pressure to both fork blades to the exact area it was bent back .
By ramming it into a wall you risk ruining your fork or the frame.By taking the fork off and doing it in a vise it will tend to bend where the vise jaws are clamped on the fork tube. You may straighten the fork , but also may damage or buckle your fork tube.
By using the jack you have control