There are a few factors involved in the stroke length or the
“throw” of the tattoo needle. The throw is the distance that the
armature bar pin or nipple travels. It will move in a circular fashion
with the center of the radius being the fulcrum point where
the rear spring mounts to the deck of the frame. If you can imagine,
a circle going around that point – the length of the armature
bar (like a compass – the needle and pencil kind). The greater
the angle of deflection utilized raises the entire a-bar assembly,
the longer the stroke of the machine will be. This will also
require the contact screw to be raised up more toward the front
binding post mount to accommodate the increase in the angle.

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