I picked up a '51 3100 a little while back and am looking for the proper tools to do a little work. I need the tool for the recessed bolt heads. Would this be a screwdriver-type tool or a ratchet-type. And where would I find a set? I have "modified" some screwdrivers and small sockets that are somewhat doing the job, but would love to have the tools that were made for the job. Thanks in advance....