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For over twenty years the unique features of our Spring Loaded Dent Ball Driver have made it the best driver available in the industry. No other driver provides the control, speed, or versatility, and so even if you already own a tool for driving dent balls ours will quickly pay for itself both in time saved and performance.
Using a trumpet bell crook as an example, the driver is set up for operation by first adjusting the position of the rubber bell stop on the housing. This sets the housing far enough inside the bell pipe to provide maximum support for the flex coil, yet not so far as to risk the housing causing damage to the instrument. Next, the length of flex coil extending out the front of the housing is adjusted so that with the instrument mounted against the bell stop the end of the coil is 1" to 2" (25 to 50mm) past the location of the dent. Attach the proper size dent ball and the tool is ready for use.
One of our driver's uniques features is the manner in which the flex coil with attached dent ball interacts in relation to the housing. While the flex coil freely slides through the housing it is attached to the driver shaft and an internal spring. This allows the housing to remain stationary in relation to the instrument while still allowing the coil and dent ball to move forward as necessary to raise the dent. The coil moves, not the housing, providing a real safety net for the technician by eliminating the potentional for the driver damaging the instrument when the dent ball slips past the dent.
This feature explains why during setup the coil is adjusted so that the dent ball is positioned the 1" to 2" past the dent. As the instrument is mounted onto the driver the dent ball will reach the dent before the bell stop engages the bell flare, and continued pressure will engage the internal spring until the bell flare lodges against the bell stop.
The technician then uses one hand to hold the instrument solidly against the bell stop while using the other hand to work the dent out, either by grasping and pushing forward on the driver ball to push the dent up or by using a dent hammer. As the dent is raised the dent ball will slip on past allowing the internal spring to relax. The instrument is removed from the driver and the next size dent ball is attached.
The amount of spring tension can be easily adjusted from zero to maximum depending on the what is required for the job. Typical dent removal jobs may require first 'roughing' the dent up by forcing balls through to get the dent partially raised. Spring tension can be set high, and if more pressure is needed simply grasp and push forward on the driver ball. After the dent is partially raised by running through several balls, the spring tension can be lessened so that more precise work can be done with the dent hammer. Whether using strong or light tension, the spring will maintin a forward pressure on the dent ball against the dent.
Another unique feature to our Spring Loaded Dent Ball Driver is that it can be used either clamped at variable angles in a standard bench vise or by using the leg rest. The leg rest has the advantage of allowing the instrument to be easily held and maneuvered around in a variety of positions while allowing the hammer, as well as the technician's visual inspection, greater and easier access to the dent.
TROMBONE TUNING SLIDES
Remove the rubber bell stop and clamp the driver in a standard bench vise. Adjust the flex coil length and attach desired dent ball as in Fig. 1. Mount the crook onto the flex coil, bringing it up to rest against the end of the housing. Use the black ball knob to push up major dents (Fig. 2) and then a dent hammer for final removal (Fig. 3). Each time the dent is raised enough to allow the dent ball to pass, the internal spring will push the flex coil and dent ball on through the pipe while the housing and crook safely remain stationary to one another.
Don't keep buying tools that are awkward to use or that will only work on a few types of horns or repair situations. Our driver will work on trumpet/cornet bell crooks, trombone/euphonium/french horn tuning slides, and practically any other situation where a dent ball can be used. Its performance is unsurpassed - we have sold hundreds of this tool and to date have never had one returned. Comes with complete, step by step instructions.
NOTE: Barrel shape dent balls are required for use with this tool and are sold separately. We offer our #2486 Barrel Dent Ball Set, however any set will work well with this tool. Note that dent balls require a 0.171" (4.3mm) diameter hole, if your set has a smaller hole they can be easily enlarged using a 11/64" drill (ask about our drilling jig).