Foredom HP775 Duplex Spring Adapter Product Description The Foredom HP775 Duplex Spring Adapter is a precision-engineered accessory that adds a remarkable degree of extra flexibility to any Foredom flexible shaft system. Designed for intermittent, light-duty work, it serves as a seamless extension between the back end of a compatible handpiece and the flexible shafting, allowing craftspeople to maneuver into tight angles and confined workspaces that would otherwise be difficult or impossible to reach. The spring drive is constructed from special steel, double-wound in a tubular configuration, and is enclosed within a protective flexible spring cover for durability and long service life. The adapter connects at both ends using key-tip alignment — simply align each key tip within the slot of each shaft connector for a secure, reliable fit. When the job calls for less delicate work, the adapter removes quickly and easily, making it a versatile addition to any flex shaft setup. This adapter is recommended for experienced users of flexible shaft tools and for those whose work demands added flexibility and reach. It is ideal for fine engraving, detailed carving, jewelry work, dental lab applications, and other precision tasks where a straight handpiece-to-shaft connection limits access. What's in the Box (1) HP775 Duplex Spring Adapter Please Note: This product includes the Duplex Spring Adapter only. The flexible shaft, motor, and handpiece are shown for demonstration purposes and must be purchased separately. Key Specifications Attribute Detail Part Number HP775 Product Type Duplex Spring Adapter Drive Construction Special steel, double-wound, tubular Spring Cover Protective flexible spring cover Connection Type Key-tip to key-tip (both ends) Recommended Use Intermittent, light-duty precision work Maximum Bend Angle 45° (do not exceed) Warranty Duplex springs are not covered by warranty Compatible Replacement Parts The duplex spring components are subject to normal wear and can be replaced individually. Foredom recommends purchasing the HP7501 Sub-Assembly to avoid damaging the duplex spring during replacement. Part No. Description HP7503 Handpiece Tip HP7501 Duplex Key Tip Inner Spring Sub-Assembly HP7502 Duplex Key Tip (component of HP7501) HP76 Duplex Inner Spring (component of HP7501) HP75 Duplex Axle (component of HP7501) HP73 Duplex Cover HP47 Washer HP10531 External Retaining Ring HP46 Slotted Shaft Connector HP42 Q.D. Connector HP48 Catch Ball HP43 Catch Spring Recommended Lubricants The duplex spring component requires periodic lubrication for optimal performance and longevity. Foredom recommends the following lubricants Part No. Description MS10005 Foredom Motor & Handpiece Oil (hypodermic dispenser) MS10006 Foredom Flexible Shaft Grease (1-oz. tube) Important Usage Guidelines To maximize the lifespan of your HP775 Duplex Spring Adapter and ensure safe operation, please observe the following: Do move the workpiece slightly further from the motor when using the Duplex Spring Adapter, to prevent sharp bends in the duplex spring. Do not subject the connection to bends exceeding 45 degrees, as this will cause frequent breakage or kinking of the springs. Do not use the HP775 with large buffs greater than 1 inch in diameter, aggressive burs, or chisel handpieces. Do not exert excessive pressure on the work — let the speed of the tool do the work. Note: Duplex Springs are subject to breakage and are not covered by warranty. This product is intended for experienced flexible shaft users.
