Any one who has any underhammer lock plans I would be interested in seeing them or if you have any links for on the web. I have been to the Blue Grouse one. I would like a lock designed with coil springs if possible but would consider flat springs as well. I am aware of Logan's Book on the underhammer but the local library cannot get it for me due to state budget cuts. They may be able to get it from a school in the fall but that is long to wait and maybe if any of you have read it you could tell me if it will help me or not? Jim