Ok, found a similar question on a German Forum. They are pressed in and basically you cut a thread into them, insert a bolt and pull them out. Obviously they are scrap after this.
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So for now i'll leave them in.
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My 3VD carbs had a 140 main jet, these have a 155. So...... fit the 140s to this carb or is the carb construct such that there is no coralation between BDST and BDSR carbs?