I recently found my father's old cameras during a spring cleaning. For some reason he stopped using them quite a few years ago and can barely remember how to operate them. As far as I can tell, the F-1 works and probably just needs a cleaning. From what I've read I'll need to get an alkaline adapter or a zinc-air battery, although I was wondering if I may use it without a battery since the slower shutter speeds are supposed to be mechanical. Apparently the AT-1's battery should be easier to procure, but it doesn't seem to be in working condition; the film advance lever doesn't seem to be working. It seems unlikely, but does it need a battery to work, or is it stuck? I'm in Singapore, so if you could point me to any place that can help me clean the insides of the cameras, fix them if necessary and have the necessary batteries & adapters to get it working I'll appreciate it. Thanks in advance!