Or leaf shutter question in general, as I've noticed the same with my Rolleicord and Rollei 35. After setting exposure time and aperture then cocking the shutter, is it a no-no to then reset exposure time? I just notice that when I do reset the exposure time with the shutter cocked, there's a scritchy-scritchy sound that does not sound appealing. Am I screwing something up here? With the Hassy it's particularly troublesome, because the shutter has to be cocked to frame and focus a shot. Basic question then: once the exposure is set and the shutter is cocked, is it a no-no to change shutter speed?