of central portion 27 are bolt holes for bolts 24 looking at brush 10 in fig1 bracket 15 has two vertical arms left arm 16 and right arm 17 have apertures 25 and 26 respectively near their upper ends apertures 25 and 26 accept pivots 20 and 21 respectively for connecting vane 22 to bracket 15 pivots 20 and 21 are suitably pivot pins such as rivets the upper ends of arms 16 and 17 are finished off with forward motion stops 31 and reverse motion stops 30 vane 22 is substantially rectangular with either rounded or square corners the area of vane 22 is desirably in the range of 50 to 100 of the bristle end surface of brush 10 while any amount of vane area aids surface contact vane area less than 50 of brush area produces noticeably less than optimum affect and vane area greater than the brush area increases the bulk and wieldability of the brush to an undesired extent a preferred means of adapting vane 22 for connection to pivots 20 and 21 is depicted in fig4 and 5 tabs 32 and 34 are punched out of vane 22 which is suitably a sheet of aluminum tabs 32 and 34 have pivot apertures 37 for receiving pivots 20 and 21 punching out of tabs 32 and 34 leaves apertures 35 in.