How to repair broken drill gearbox

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How to repair a Dewalt DCD778 cordless drill with a stripped out slipping gear.

Professional gas burner made of BOLT and NUTS!!!

إصلاح دريل apt شحن /صيانة دريل ماكيتا شحن وطريقة تشحيم التروس والفك والتركيب وشرح وظيفة كل ترس