Mokhoa oa ho phunya lesoba lee la conical holim'a poleiti ea MS & SS? Re na le mehato e meraro, re khetha likotoana tse tharo tsa ho cheka ho cheka poleiti, eo boholo bo ka bang 20mm botenya. Mohlala, ha re phunya poleiti e le 'ngoe e nang le botenya ba 20mm, re qala ka ho cheka boholo bo bohareng ho cheka botebo ba 18mm, ebe re phunya poleiti ea ho qetela ea 2mm, qetellong re sebelisa boholo bo boholo ba ho phunya ho etsa hore lesoba le holimo le be leholoanyane. ho fihlela botebo ba 10mm. Ehlile botenya ba poleiti bo ipapisitse le tlhokahalo ea bareki, re sebelisa mochini oa ho cheka o tsoang kantle ho naha, o ka bonoang marakeng oa China ka seoelo, ke lona lebaka leo ka lona re ka etsang lesoba la conical bakeng sa bareki ba rona.