1. Cov hammers tau txais kev tsim ntau zaus, qhov cuam tshuam zaus yog ze rau lub valve tsis muaj rauj.
2. Tag nrho cov khoom yog ua los ntawm cov hlau tshwj xeeb zoo, thiab qhov saum npoo yog hardened, thiab nto tiav lawm, uas tuaj yeem ua kom zoo hnav tsis kam thiab lub neej ntev.
3. Yooj yim struture, siab realiablity, yooj yim rau disassemble thiab tswj.
4. Lub zog cuam tshuam yog siab dua li hom valveless.Nws yog heev haum rau dej zoo drilling.Cuttings yuav tsis thim rov qab rau rauj.
Pob khoom: Peb qhwv cov hammers rau hauv lub hnab yas, tom qab ntawd muab tso rau hauv rooj plaub plywood, thiab tom qab ntawd khi lub rooj plaub.