no one on the list ever seen motor driven tear offs that were used in MX and other forms of off road events???coil of lense material in a small cannister with battery powered motor - press button and it advances a certain distance across the visor. phil hitchcockpre 1990 ducatis a speciality with the emphasis on bevel singles & twins road and race motorcycle engineering 2 bon mace close berkeley vale nsw 2261 australia www.roadandrace.com.au         SALES@ROADANDRACE.COM.AU