Originally Posted by Wordbiker

You should be able to cut a fork at home.

Find a steel topnut to fit the fork, thread it on and use it as a cutting guide. Once you've filed the cut smooth, give the threads a slight bevel on the edge. Removing the nut should clean up the threads.

Just be sure to check if the fork has enough threads for your headtube length and headset stack height. Pre-assembling it is a good idea before committing to cutting.