Beseler 67s Enlarger

I delved into the Beseler enlarger a little more deeply as I am writing out my 'process' for the printing portion of the whole darkroom process. This Beseler enlarger did not come with a manual. I purchased one from Canada and it is still not the exact manual, as it covers the 67SC/67SD. And this supposed manual does not tell you really how to operate it during the actual process - you are supposed to know everything about it so it seems. And of course the enlargers I've used in classes were not this particular model either. After reading up on the enlarger process in several books I have, I ended up calling Freestyle in southern California as they have a 800 number.

I was able to find out some of the issues I had like there is no white lite switch (though the manual refers to one); however it is turned off when I plug the enlarger into the timer! Easy enough! And there is no contrast filter as this is a dichroic color enlarger and the contrast for B&W is done with the magenta filter! So now I know how to take care of those issues. I think I found out on my own thru the Beseler website that the silver little handle is actually a 'tap screw', but I still don't know its' purpose or function. So if anyone knows, let me know!