All of my 5 G250's, except one, have the same adjustment knob as your pictured 156 so I looked it up on both the 109/15X and G250 parts breakdown and both show to have the same 11-250-009 part number. However, the parts breakdown PDF you provided for the CE shows a part number of 11-150-104 and appears to be the same and I assume that it is since it will fit. I guess they "upgraded" the part number so it relates to the CE version only. ???? .... So if you had a "sacrificial" G250 you could use those parts to return the 156 to it's original condition or am I missing something here?