How much precum (Cowper's gland secretion) do you produce?

Five year update:
@Slippery... nice work. This is a five year update and I never collected a baseline value. Judging from the spot on my towel I guess the volume hasn't changed much (still in the middle of the curve approximating 1/4 teaspoon.) Of Aneros tools, MGX remains the tool that produces the "mostness" The big change with age has been the viscosity of my precum. It's rather stringy now. ... rook

I produce it in a continuous stream most times, especially when using an MXG. Love the stuff! Great nipple lube.

I’m 61 and the use of my Progasm combined with nipple play produces a good quantity of precum; a lot more than when regular masterbation. 

I'm 65 and have produced a lot of precum my whole life. If I'm horny and stimulated mentally, it starts flowing and I can get quite the wet spot in my shorts. Not surprisingly, during Aneros use I usually keep a napkin or paper towel handy to collect the continuous drips. What I do find interesting is that, if I masturbate after a long Aneros session (which I usually do), I don't ejaculate as much cum as during a "normal" j/o session. I am pretty sure this is because the prostatic secretions (precum), which accounts for most of the volume of an ejaculation, has been pretty much completely spent by the Aneros.