and aligned with the glass receiving groove 28 on the front side 26 of the clip 10 the backside 24 of the clip portion 10 also has an engagement section 40 shown in fig1 as a u shaped groove the engagement section 40 is designed to receive the connecting portion 22 of the hub 20 fig2 and 4 illustrate various views of the hub 20 the hub 20 is generally disc shaped having an interior section 42 with an enlarged diameter 44 the interior section 42 has a back face 46 with two projecting members 48 and 50 as connectors for cooperating with an operating mechanism 52 as shown in fig5 a front side 60 of the hub 20 has a smaller diameter section 62 that is adapted to project through the frame member 12 the front side 60 of the hub 20 cooperatively engages with the backside 24 of the clip portion 10 via the connecting portion 22 or other cooperatively aligned engagement the hub 20 also has a mounting hole 64 located in the center of the hub 20 the mounting hole 64 of the hub 20 cooperatively aligns with the mounting hole 34 of the clip section 10 to accept a screw mounting not shown the connecting portion 22 shown here as a tongue projects beyond.