SRAM X7 shifter - Sticking downshift thumb lever

The down shift lever on my SRAM X7 shifter (2010 model) is sticking. By taking it apart and cleaning and re-lubing, it's much better. also changed the cable and outer. However it's not 100%, still sticks occasionally.
The key seems to be how tight you do up the bolt the thumb lever and other mechanisms rotate round
Anyone got any tips/ideas on getting it back to full working order?
The key seems to be how tight you do up the bolt the thumb lever and other mechanisms rotate round
Anyone got any tips/ideas on getting it back to full working order?
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