top cover plates 36 a and 36 b of gear guards 32 a and 32 b further each gear guard 32 a and 32 b is provided guide and alignment openings 38 fig2 for receipt therein upon assembling the brush assembly of extended tabs 39 of brush support beam 22 as the gear guards are brought together about brush support beam 22 tangs 34 on both gear guards 32 a and 32 b slide under extended tabs 39 of brush support beam 22 engaging slots 41 fig5 of u s pat no 6 009 593 thereby locking gear guards 32 a and 32 b to brush support beam 22 a plurality of downwardly projecting tangs 151 extend from the top cover plates 36 a and 36 b of gear guards 32 a and 32 b respectively as best seen in fig2 and 4 these figures illustrate that the tangs 151 are attached to the top cover plates 36 a and 36 b of gear guards 32 a and 32 b however it should be noted that the tangs 151 can be integrally formed with the top cover plates 36 a and 36 b of gear guards 32 a and 32 b each of the tangs 151 has one end 93 attached to the top cover plate 36 a or 36 b and the other end 95 extending freely each of the tangs 151 has a hook portion 91 located approximately midway between its ends dividing the tang 151 into.