Ko te Knuckle urungi, e mōhiotia ana ko te "ram angle", tētahi o ngā wāhanga nui o te piriti urungi waka, ka taea te whakahaere i te waka kia pumau, kia āta whakawhiti hoki i te ahunga o te haere. Ko te mahi a te knuckle urungi he whakawhiti me te pikau i te kawenga o mua o te waka, tautoko me te taraiwa i te wira o mua kia huri huri noa i te kingpin me te huri i te waka. I te āhua taraiwa o te waka, ka pikau i te kawenga pānga rerekē, nō reira, me whai kaha teitei, me uru te knuckle urungi ki roto i ngā pū e toru me ngā pūtu e rua me te tinana kua honoa, ā, mā roto i te flange o te kōhao whakairinga parai me te pūnaha parai. Ina tere te waka, ko te wiri e tukuna ana e te mata o te rori ki te knuckle urungi mā roto i ngā potae te mea matua hei whakaaroaro mā tātou i roto i tā tātou tātaritanga. I roto i te tatau, ka whakamahia te tauira waka o nāianei hei whakamahi i te whakaterenga ā-papa 4G ki te waka, ā, ka tatauhia te kaha tautoko o ngā pūwāhi pokapū e toru o te pū o te hononga urungi me ngā pūwāhi pokapū o ngā kōhao whakairi pūtu e rua hei kawenga kua tukuna, ā, ka herea te herekoretanga o ngā pūnga katoa i te mata pito o te flange e hono ana i te pūnaha parai.
