I picked up a nice Konica III but it takes some shutter actuations (typically 5-6) before the shutter will operate properly. This usually happens again after changing the shutter speed. The shutter blades will either not open, open slowly and stay open, or open and not completely close. Is there a way to get to the shutter blades and flush out dried out lubricant, which appears to be the problem? When the shutter is operating properly, the shutter speeds sound right and the self-timer operates smoothly.