What I mean is that the best way to double the size [or serving #] of a beverage is not always to multiple by 2. For example, when using a chemex brewer I have found that the best way to prepare 2 cups worth of coffee is not always to double the coffee weight and water weight. Rather, I only ad another 50% of the coffee weight, usually, and double the water weight.

Can do. I'm interesed to see what kind of feedback I get before making a screen.

No real over all certification. You can get training from manufactures and they may "certify" you to repair their brand. As a company we receive training from manufactures regularly.

Eli,
The best way to become a "certified" machine tech would be to go to work at the ground level in a factory authorized machine distributors and/or coffee roasters service dept & work your way up then hope/ask for a certified factory training after some time from the company. There are also a couple companys offering schools available through SCAA. Regardless, the only way to really get good is to polish your skills by doing service jobs every day on lots of different brand machines for a long time, rebuliding & modifying alot of machines & reading, researching & networking alot. Cheers! - Matt

haha single or double spouts and on what type of portafilter?

hello, eli is my sons name too, and i find this name over the top...hope to see you somewhere...

okay. you start.