The flexible inner shaft should be checked, wiped clean, and relubricated with grease every 50 hours of use. With every 200 hours of use, the shaft should be thoroughly cleaned with solvent and lubricated. Instructions for lubrication are detailed in your machine's Owner's Manual which is available in the Download Center located in the right hand column of the website. We also recommend that you watch our maintenance videos which offer step by step help with routine maintenance.Flexshat Grease SKU: FOR-MS10006 UPC: 098666719152 BRAND: Foredom MPN: MS10006 Made In: United States Check Out The Foredom Tools CatalogForedom Kits and Their Components Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.B044C^