Lock the blade into a Vice and then tap it with a rubber mallet till it goes true again.
Bankschroef
I agree with the suggestion to send it back to Vic. However, since the knife has sentimental value, be sure to note this on the warranty form, as well as that you want it returned to you even if it is not repairable. Otherwise, they may simply discard it and send you a replacement.This is a vice:http://diysolutionsonline.co.uk/content/images/thumbs/0002355_DIY-Solutions-Online-45232-DRAPER-150mm-Engineers-Bench-Vice-VICES.jpg