TEHX take-up lever boss alignment

I aligned the needle bar case on the 1st* needle bar Take-up Lever Boss centered squared to the housing (8mm dia. roller of Take-up lever drive lever B). As I did the colour change by moving the needle bar, take-up lever boss shifts gradually to left of the housing on each colour change. Eventually, take-up lever boss is almost 5 mm off the housing.
*I also tried aligning on the 8th and 15th needle, all resulted the same.[ATTACH]111525[/ATTACH]