Dan Kubin Weighted Impact Screw Kit
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"New weighted impact screw updated! I have found that it helps with the stability of the stroke, and improved overall performance. Also, note the position of the rubber band is another simple adjustment item. For lower volt operations, or a harder hit, position the band pointing slightly upwards. This will reduce the tension on the return spring making it work better at slower speeds and decreasing the amount of give. The bonus is less tension on the rubber band."
Thanks - Dan
Weighted impact kit specifications:
* Upgrade for Dan Kubin V3R with upgraded armor bar (late 2019 to present).
* RHC 60 custom heat treated tool steel plus O-ring.
* Easy interchangeability to increase stroke while improving overall feel and sound.
* Kit also includes both 1.5mm and 2mm L spanner
Step by step upgrade: (see photos for guidance)
1. Use the 1.5mm spanner to loosen the set screw on the side of the truss rod. Half a turn should loosen it enough to easily remove the impact bolt.
2. Hold the armature rod and use the 2mm spanner to remove the old impact bolt.
3. Once removed, use the 1.5mm spanner to insert and tighten the weighted impact bolt down until the O-ring starts to protrude as it contacts the top of the armature.
4. This is the most important step and will affect the timing and travel of your machine.
* While holding the armature rod down, roll the cam back until it contacts the vertical spring and stops smoothly. In this position, the timing mark on the cam should align with the centre of the timing mark on the frame.
* If the timing mark on the cam is on the low side of the timing mark on the frame, tighten the weighted impact a little until it rises to the centre of the timing mark on the frame.
* If the timing mark on the cam is on the high side, the impact is too far in and needs to be backed out (loosened) until the timing mark on the cam is in the centre of the timing mark on the frame.
5. Use the 1.5 mm spanner to tighten the set screw on the armature rod side.
6. Your machine is now upgraded and ready to use. One note would be that the new impact works well with the rubber band pulled slightly higher on the needle bar so it is perpendicular when the armature is in the down position.
