thusband The internals of the group are slightly different to a standard E61, in terms of the spring types, count and position.
- This spring is unchanged
- This spring has increased tension (around 12.5+ bar = to that of spring 3 so the preinfusion chamber won’t open during the shot
- This spring is absent as is the valve, because these functions are now performed by the disabled preinfusion chamber
![](https://i.imgur.com/SmGgemz.png)
This means the best position for actually screwing on the lower half will be when spring 2 is under Minimum tension. This will be either lever at 45 degrees (neutral position) or lever up as if pulling a shot.