Application guide for carburetor for John Deere model 40-320 tractor. Also fits other models in series. Send yours for re-conditioning or swap with us, where available. Units are completely cleaned and reconditioned with new parts kit and other parts as required. Yes, we get those “balls” out. Repairable, restorable core required. See BLOG “Carburetor/Magneto Cores” on this site. Bad or broken stem threads not a penalty. No warranty is expressed or implied.