Excalibur says not to use a shaft lighter than 350 grains is that counting the weight of the point also or just the shaft?I have some Horton graphite arrows with half moon nocks can I pull them out and replace them with inserts and use them in my pheonix?I have a whole bunch of 2315 arrows can these be cut down and be used or do I have to use 22 series arrows.Anyone use a Boo string ,how good are they and where do you get them? Thanks for any info