I am not sure either, if you are thinning a point, work on the tip and base from the start, get them thin as early as possible. Once your point starts getting fairly thin, it is very easy to break them hitting on the base and the tip. As far as fluting a Clovis, putting the flutes on the point is pretty much the last thing you do, as far as percussion is concerned, you may do some pressure flaking to line up your edges and to shape your tip. Bill