I discovered a new scratch technique tonight (8th Dec 2014), I call it ‘The Spindle Scratch’.
As you move the record forward with the tip of your index finger you simultaneously brush the underside of each finger over the central spindle on the turntable.
Each time a finger hits the spindle it causes a break or pause in the forwards movement of the record. Brushing 4 fingers over the spindle on 1 forward movement results in 4 momentary pauses in the sound, creating a 5 step tear essentially. Doing the same on the backwards movement achieves the same effect.
You can play with the amount of fingers that are brushed over the spindle and obviously being a 1 handed non fader technique means that his can be used in conjunction with an crossfader or upfader techniques.