Scuffed the inside of the HS skins before starting the dimpling process. Thought it would be easier to scuff them before all the dimples were added. Finally got my bride involved running the DRDT-2 dimpler. My son, Kevin, also helped dimpling the skins. The DRDT-2 was very nice to use. I think you would need to have four arms and hands to use the C-frame and mallet method to dimple.
