IR impact Will not shut off. Ingersoll Rand 2135 and others , Throttle valve

My impact always runs will not stop. For the Ingersoll Rand 2135 and others you can buy rebuild parts for the gun and the throttle assembly . How to put Ingersoll Rand 2135 trigger back in . This air impact gun throttle rebuild . Impact keeps running. A seal in the throttle is bad. Use air tool oil to reassemble . Air impact repair. Ingersoll Rand 2135 and others will probably be the same.