Latest project, had this given to me by a Pal, all the batteries were dead and the analog portion didn't work. Took it apart found some gak (technical term for dirt) at the business end of the setting stem, cleaned it out with high pressure air and a micro drop of electronic cleaner/lube. Installed batteries, re-installed crown/stem, pushed all 3 buttons at once away she went. Working fine and nice and accurate. Unlike some other projects I'm going to do anything for the case, crystal etc. so I shall leave it as is as it looks pretty good.