Visit The Home Depot to buy Diablo 4 in. x 5/8 in. 50 Grit Coarse Grinder/Sander Conversion Kit DCP040VGPS01G ... Step 4 ndash; After the Diablo Backup Pad is on the spindle, insert the Diablo Fiber Disc on top of the backup pad on the spindle. ... Rated 1 out of 5 by Scott from No Instructions I bought this with hopes of using my 4 inch ...