in position provide opposing forces sufficient to urge its associated glass panel outwardly and securely against the foot element 32 of the retainer when the spacers 40 42 are in place they also urge the outside edges of the glass panels 12 14 respectively against the foot 32 of the retainer 28 as previously discussed the retainer 28 includes a securing head 52 extending from the center of the retainer base element 30 opposite the foot element 32 the securing head 52 has a t shaped transverse cross section and extends lengthwise along the retainer 28 the securing head 52 is configured for engagement with a reciprocal t shaped channel 54 defined by framing member 10 as will be discussed in further detail later in this application t shaped securing head 52 may slide freely within securing channel 54 when the spacers 40 42 are not in position such as shown in fig2 however when the spacers 40 42 are in position as shown in fig3 the securing head 52 is urged against the framing member 10 such that the frictional force between the elements 52 10 effectively 34 locks 34 the elements together installation of the overall assembly proceeds as follows first referring to fig2 the securing head 52 of the elongate retainer 28 is slipped inside the securing channel 54 of the vertical framing member 10 and slidably positioned along the vertical framing member as desired then the glass panels 12 and 14 are inserted into the u shaped glazing channels 58 and 60 of the retainer 28 respectively proceeding left to fight for example next now referring to fig3 the spacers 40 and 42 are wedged into.