Autolite 2100 - adjustment questions

[malloyjp]

I have a 1969 autolite 2100 and I'm trying to dial in the fast idle setting. The book calls for 1600 rpms on fast idle. I know the adjustment screw rests on little steps that drop the idle down. But I can barely see in there to know what's going on or how to correctly adjust it. Is there a methodical way to get this thing set to 1600 rpms on start up other than trial and error ? Also, it has an automatic choke setup. I've played around with moving the black plastic cap for lean and rich settings. I suppose that determines how fast the spring inside expands to open the choke, but I'm not seeing a whole lot of difference when I adjust the cap. What are people's experiences with these auto choke adjustments ? I'm wondering if I'm doing something wrong of if the whole thing is just a cruel joke by Ford. Thanks !