Bausch & Lomb tessar 1c, take apart ?

I'm wondering if anyone has been able to completely disassemble a B&L tessar series 1c ?

The front and rear element screw off, but the aperture ring has me flummoxed
there's usually a combination screw/pin that engages the moving aperture ring
but I don't see one.

Jim

https://1drv.ms/i/s!AggQfcczvHGNgkP30QQrY1NPA1aA?e=0nHtEi Back when, Bert Saunders sent this to me.

Ah HAH !!

Thank you Dan !