Mamiya-6 auto stop problems

[Themckane]

I picked up a Mamiya-6 folder with a 6x6 and 6x4.5 option
Slide the window in front and the Lever in the back of the camera to change the size

I cleaned the lens and viewfinder. The auto stop worked a couple of
times. But has stopped working.
I am not sure what it would cost to get fixed

Can I just use the window and stop on the # to take my next shot ?

Thanks