Hi , you seem to be the one to ask is there an insert that will fit B110 leg as standard internal diameter is 40mm at best , I will be upgrading eventually (Gaz 2.25inch legs)but at a cost of 250£ per leg its not poss at the moment.... any advice would be much appreciated as there s not much info in the uk ive been told B310 are direct swap is this true . thanks Paul