OK, this morning my ancient RCBS single stage press decided to stop working. I disassembled it to de-gunge and lube it. I put the clip and wavy washer in a plastic tray. Things went well. Went to put it back together. Wavy washer is AWOL. Could not find it anywhere. Put everything back together and decided I should measure the cross-pin to be sure of the diameter when I cruise to the hardware store to get another couple of wavy washers. (Unless they are godawful expensive I always buy two replacement parts.) I pick up my electronic caliper to measure the cross pin. It saw 0.25. That just does NOT look right. Measure again. 0.25. Check the linear scale on the caliper "arm". It says .5 inch. I turn the thing on and off a few times. No joy. It seems to be measuring EXACTLY 50% of the actual size of whatever I am measuring. I can't figure out if there should be some sort of a switch to get it to do this. I am very puzzled. Any ideas??