[Firenock]

While we are at the subject of string serving jig, I believe I have the most advanced, highest engineered in design, and most durable. That is why the price starts at $250.00. So I guess only the real string professional would purchase it. It is not a simple machine and has a learning curve to it. Below is the link to it. It can provide up to 26lbF constant drag pressure even at 13000 RPM. Its body is made of 7075-T5 aluminum. The hollow roller and all fasteners are made of GR5 titanium. The drag dog is made of 304 stainless. The piece has 6 ABEC#3 flange bearing, three ball bearings and two thrust bearings, so a total of 11 bearing in it! The nine-element drag system consists of 4xGR5 titanium and 5x1mm Carbon Drag washers and comes standard with Dupont Krytox Pure PTFE Lubricant preloaded. Not to mention a customizable spring loaded string release/engagement lock. Did I mention you can change the spool, or the entire spool shaft/drag system on the fly while maintain the preset pressure!

https://www.firenock.com/abssj