***UPDATE***
I just put togeterh all the info you need to buy replacement parts for either the FLEX XC 3401 VRG - it's my assumption that because the Harbor Freight Hercules HC109B Forced Rotation Dual Action Polisher is a copy of the FLEX XC 3401 VRG - that theh replacement FLEX parts "should"...
More..
Here's our fresh video on using gear-driven orbital polishers
Here's my full-blown review and breakdown for the Harbor Freight copy of the original BEAST. I torture tested this tool on a fresh-out-of-the-paint-booth, 1959 Rolls-Royce Silver Cloud.
Review: Harbor Freight Hercules...
Where to Buy a Replacement Felt Ring - FLEX XC 3401 VRG Harbor Freight Hercules HC109B Forced Rotation Dual Action Polisher by Mike Phillips
Due to the number of videos and articles I've created over the years about the FLEX XC 3401 VRG aka the BEAST and the new Harbor Freight Hercules HC109B...
The location of the Felt Ring on the FLEX XC 3401 VRG aka the BEAST as well as the copy of FLEX XC 3401 VRG the Harbor Freight Hercules HC109B Forced Rotation Dual Action Polisher by Mike Phillips