First I’ve heard of this, and I’m perplexed as to why anyone would want to use one too. Fortunately, I have approximately a lifetime supply of the standard inserts and weights. The thing that strikes me is how hard they would be to remove without damaging the shaft. With the standard inserts with or without weights, I have to screw in a field point, the heavier the better, and heat it up little by little, without scorching the shaft, so the heat travels down the insert and melts the glue. That would be very difficult to do with the looong insert shown in your photo.