How you lower your flaps depends on the radio you are using. If the radio has a flap channel that has an adjustment knob then you can use that to lower your flaps, and the amount that you lower them is adjustable. Some radios only have and "on-off" switch and the flaps are only up or down, and you have to adjust the amount of travel with your linkages. Some radios have a combination of both. My Airtronics radios have a 3 way flap switch. Position one is flaps up, position 2 is flaps down but adjusted with the flap knob, and position 3 is the flaps fully extended. Anyway, asking in here about how to control the flaps is somewhat of a moot point. You'll set it up according to the radio that you use.

Hope this helps

Ken