Milk jug washers

Here is a pic from the January 2000 issue of S&T with the famous 8" dob test report. For those of you wondering exactly what they are.
Jason

Attached Image:

Sorry for the HUGE pic, but I wanted it clear.
BTW I used 2 washers on my Discovery 8" f/6 and feel it is perfect.
Jason

Thanks a whole bunch for the picture, Jason! All these while, I thought everyone was referring to the read washer below the milk jug cap :-(. Great helpful picture!

Ron B[ee]