Magawo operekera mipira ya pilo amakhala ndi choperekera chomwe chimayikidwa mu nyumba, chomwe chimatha kumangiriridwa pamalo othandizira. Ma block a plummer ndi ma block operekera mabotolo odzipangira okha kapena ma bearing a mpira. Mtundu uwu wapangidwa kuti ugwire ntchito yonyamula katundu wambiri komanso liwiro lapakati ndikulola kusweka kwa shaft popanda kusuntha choyikamo cha nyumbayo.
