201 and 202 align routed pockets 208 211 and press in h connectors 205 and 206 each window casing 203 and 204 includes a dado 212 and 213 to receive a zipper tie connector 130 139 for joining to side and top window jambs 102 104 more details on the zipper tie connectors themselves are provided in fig6 in one prototype embodiment that provided good results the h connectors were about u215c u2033 wide u215c u2033 tall and u00bc u2033 thick the router pockets 208 211 were machined to match in fig2 it can be seen that the routed pockets 208 211 are not evenly distributed along the length of mitered edges 201 and 202 this is deliberate better results are produced by grouping them nearer the outside corner costs can also reduced by being able to use fewer h connectors fig3 provides detailed top end and side views of a typical h connector 300 two legs 301 and 302 are joined by a crossbar 304 each leg 301 and 302 has a tapered end 306 and 307 to make insertion into router pockets 208 211 easier for the installer in practice the h type joint 200 has proven to be relatively expensive to manufacture and.