I may sound like a fool but im not taking any chances on breaking the rapier III adjustable i got today in a trade,,,,,it needs to be at over 12 volts and even then seems flat...there is hardly any re-coil when you push your thumb against the needle bar,,,so how do i adjust the throw? i notice a screw on the outside of the back and a mini screw inside it,,,,i get the feeling its the mini screw.....a diagram or video would be a blessing!!! better to sound like a fool than bust the machine,,,,i had two rapiers before but they were fixed stroke.

thanks guys...