▁sh av ings ▁emer ge ▁through ▁a ▁slot ▁along ▁the ▁bla de ▁edge . ▁It ▁is ▁important ▁that ▁the ▁cyl ind rical ▁alignment ▁hole ▁closely ▁fit ▁the ▁diameter ▁of ▁the ▁p enc il , ▁to ▁keep ▁the ▁p enc il ▁from ▁wob bling , ▁which ▁would ▁cause ▁stepped ▁or ▁l urch ing ▁cut - depth s ▁and ▁point ▁break age . ▁Another ▁important ▁feature ▁is ▁a ▁larger ▁clear ance ▁hole ▁at ▁the ▁end ▁of ▁the ▁cone ▁allowing ▁sections ▁of ▁the ▁p enc il ▁lead ▁which ▁break ▁away ▁to ▁be ▁removed ▁with ▁only ▁minor ▁incon ven ience . ▁Pr ism ▁sh ar pen ers ▁can ▁be ▁bare ▁or ▁en closed ▁in ▁a ▁container ▁to ▁collect ▁the ▁sh av ings , ▁while ▁some ▁en closed ▁sh ar pen ers ▁may ▁be ▁harder ▁to ▁clear ▁in ▁the ▁event ▁of ▁a ▁block age . ▁▁ ▁A ▁few ▁pr ism ▁sh ar pen ers ▁are ▁hand - c rank ed , ▁rot ating ▁the ▁cutting ▁bla de ▁instead ▁of ▁rot ating ▁the ▁p enc il . ▁ ▁Mod er ate ▁care ▁is ▁needed ▁to ▁not ▁break ▁the ▁tip ▁of ▁the ▁p enc il ▁being ▁sh ar pen ed , ▁requiring ▁the ▁p enc il ▁to ▁be ▁sh ar pen ed ▁again . ▁However , ▁because ▁p enc ils ▁may ▁have ▁different ▁standard ▁diam eters ▁in ▁different ▁nations , ▁imported ▁sh ar pen ers ▁may ▁have ▁non - standard - s ized ▁alignment ▁guide - hol es , ▁making ▁sh ar pen ing ▁attempts ▁difficult . ▁If ▁the ▁alignment