The 2-56 screw that I took off the battery retainer, is that the same screw I use to hold in th KXBC3 and do I reuse that spacer? If not I must have the wrong screw in my parts kit. I have two 4-40 by 3/16 and a very tiny 3/16 pan head that does not screw into anything. Mark Hogan N5OBC