Can you cut down the height of a quill stem?

Will the bolt have enough threads after shortening the stem?

i also just did the same.... i wanted my stem to be as low as a nitto jaguar (without the obnoxious angle) however my bolt wasnt threaded fully so the wedge wouldnt tighten enough once all the extra length was cut down.... but luckily i just went to my local hardware shop that stocks hard to find bolts and nuts.. got a shorter replacement... and was ready to go!

hopefully it shouldn't be hard to find a replacement.