There are front sight adjustment tools in two generic versions, one for 7.65mm guns and one for 9mm guns. Originals are expensive and repro/after market versions are still a bit costly for one-time use. Rather than incur that cost, I would recommend that you follow G.T.'s advise and use a brass or wood drift punch and judicious hammer taps to adjust your sight windage. Adjusting the shooting high is a bit more problematic since correcting that involves raising the front sight height or lowering the rear sight notch, both of which involve metal rather than mechanical work.
As G.T. said, good luck (and good shooting)!
