True Point are making the Brass inserts to get the weight correct ,to keep the deck balanced and with in Michells spec ,, ,, their will be 3 delrin spacers to get the correct height ,of 35mm the arm board is 30mm,, it can be bolted direct to the chassis ,or use the 3 spacers or add a wooden top ,, the SME version is the correct weight ,so no need for brass inserts,,