Does anyone have any knowledge of,or experience with, these portable chainsaw jigs that convert your chainsaw into a saw mill. I am having trouble finding someone to rough out my Black walnut due to the fact that it is urban grown and they are afraid of nails and such, which I understand. I have went over all of my peices, including the massive 14'x28" trunk section, with a gigantic metal detector although I dont know how far it would have penetrated into the wood and found nothing. I was around when this tree was planted and cannot remember anything being nailed or wired to the tree. I am thinking that I am going to have to cut it up myself. Any help is much appreciated.