Make the Connection with the Shopsmith Power Coupler!\nThe Shopsmith Power Coupler (503574 Power Coupler Only) is made of a virtually unbreakable plastic compound. Each end mates with splined metal Hubs that attach to your MARK?7 / MARK V / MARK 4 / POWER STATION and Special Purpose Tools such as Bandsaws, Planers, Jointers, etc.\n\nHave It Your Way: Buy the Power Coupler by itself or buy a Complete Power Coupler Kit or a Classic Power Coupling Kit!\n\nNote: The Power Coupler Kit is required to connect Special Purpose Tools (SPT's) to your Shopsmith MARK?7, MARK V or MARK 4. (It became a standard part included with all MARK?7 / MARK V's manufactured since April 1985)\n\nBuy a pair of couplers. By buying two, you'll have a spare handy and save! \n556135 (2) Shopsmith Power Couplers (Couplers Only) \n\nShopsmith Complete Power Coupler Kit (505631)\nGet everything you need to get started using your Shopsmith Special Purpose Tools in one convenient package! \nYou'll receive our durable plastic coupler, two 4-splined metal hubs that attach to the upper & lower drive-side spindles on your MARK?7 or Mark V Smart Motor, PLUS both 5/8" & 1/2" 5-splined accessory hubs to conect all your special purpose tools.\n\nShopsmith Classic Power Coupling Kit (555124)\nOrder a classic coupling kit. The classic power coupling kit includes the coupler and 2 metal hubs (one each for the upper and lower spindles of your MARK?7 / Mark V Smart Motor).\n\nNote: Special Purpose Tool (Bandsaw, Jointer, etc.) accessory hubs are not included. Order the appropriate accessory hubs you need in the Special Purpose Tool Accessory Hubs section below.\n\nAccessory and Drive Hubs\n503572 1/2" SPT Accessory Hub (for Jointer, Jigsaw or Scroll Saw) \n503740 5/8" SPT Accessory Hub (for Bandsaw, Belt Sander, Planer or Strip Sander)\n\nExtra Smart Motor Drive Hubs\n503570 Upper Drive Hub Assembly \n503738 Lower Drive Hub Assembly