There is an instrument by the name Cut.. which acts as the first Expander. Further in the series have 3 more expanders( Exp 1, 2 & 3A)
Original conversation
Split crest inserts: Cut as the first expander, then Exp 1-2-3A and the Genoa series
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Split is used to create the Ridge split.. to do advance splitting there is another series of advance instruments “ Genoa”
Yes used this