1. Cross mwekota eji abụọ perpendicular nri usoro, ọ nwere ike ibugharị na ntụziaka nke X na Y n'otu oge, na ọ nwere ike na-atụgharị 360 ° na a swivel base.
2. mgbe ọ compatille na berch-ụdị mkpọpu igwe, ọ nwere ike igwu ọtụtụ oghere na igwe nri sereral ohere mpere n'otu ihu otu oge site n'ụzọ nke aka-arụ ọrụ nri na abụọ ibe perpendicular ntụziaka ọ ga-eji dị ka ihe mgbakwunye maka egwe ọka igwe. na igwe egweri ma ọ bụ dị ka ngwa eji naanị.