Mawu akuti "3/4 inchi chubu" nthawi zambiri amatanthauza m'mimba mwake (OD) wa chubu.Kuti mudziwe kukula kwamkati (ID), muyenera zina zowonjezera monga makulidwe a khoma.M'mimba mwake wamkati ukhoza kuwerengedwa pochotsa kuwirikiza kwa khoma kuchokera kumimba yakunja.Ndikosatheka kudziwa m'mimba mwake momwe muli machubu a 3/4 inchi popanda kudziwa makulidwe a khoma.