I'm a gs racing freak. Former sponsored driver and still have my storms and run them.
If its a black head gs .15 its the same internally as the mach .15 black head from a losi
Key points I've learned;
Breathe just barely tighten it , overdo and you ruined it.
Make sure the pressure is applied evenly and piston at TDC otherwise you most likely will make sleeve a bit ovaled
Be sure to check rod bushing slop every time you Repinch. Extra stress from the increased...