I have the National Camera strip-down on the ST801, one of Larry Lyell's best. Before contemplating major surgery I recommend looking under the base plate as most of the mechanism is accessible there, the problem may be something obvious such as the mirror cocking link jammed.
Posted on Wednesday, November 03, 2010 - 07:36 pm:
I have an ST-801 which has a similar problem. The advance lever needs to be rotated all the way around til it touches the shutter button, probably 230 degrees or so. I have another ST-801 and the advance lever only needs to be rotated about 150 degrees or so to advance. What could be causing this ? Can you tell me more about the manual you mentioned ? IS it available anywhere online for download or purchase ?