The Thunderbolt Force's is new drive system is designed by Jonny Qiong - an American tattoo artist of 22 years.
It is versatile at the upper push rod with 2 springs. There is a set screw at the top to control these 2 springs or they can be tightened all the way down for maximum force. You can also remove the top spring in the push rod and use the adjustable coil machine spring in the armature bar.
This machine is completely designed to keep giving the tattoo artist more and more control of tension and throw like a coil machine, but the consistency of a rotary machine that artists expect these days. Coil machines and rotary machines with adjustable tension tend to bind up and stop running, but after testing this machine it is free of this binding.
Most rotary machines these days are fixed at 2- 4mm throw and hit very hard, which is good for tribal or big colour fill. This machine will give basically unending options of adjustability depending on how the artist needs to approach pieces like portraits or animals. Much thought has gone into how it works.