I'm thinking about turning a bass (RW fingerboard) into fretless and talked to a very respected luthier in my area about the service. He suggested that instead of removing the frets and filling the gaps with resin, he usually files them until there is only that bit that stays inside the wood and then levels the entire surface. He says the service gives perfect results and it still has the advantage of being easy later to re-fret the bass if I feel this is the case. What do you think about this? I had not previously heard about this method.