There is a brassy looking nut on the back of the enricher ****. Tighten that up until it will stay out on its own. At least that is all I had to do to get it from sliding back in. Good luck.
I think it is on the outside next to the ****. If you screw the nut out towards the **** like your trying to unthread it it pinches down on the choke **** rode and will stay in place when you turn it out. If you have the plastic cable be careful when you tighten the back nut or you will break it. Good luck