Conley Safety Shutter CLA info

I recently picked up an affordable Conley lens with a "safety shutter". It seems like a baby betax shutter no indents and a sliding arrow to chose the shutter speed. I've exercised the shutter quite a bit but it hangs pretty badly on the slow speeds so I figure I can add a little graphite dust where it will do the most good. I've searched the web for any sort of repair manual or "tips" on where to put my graphite dust but, no luck. Any of you tinkerers know where I should lubricate ? TIA