I use an ordinary hack saw.
Just need to cut right around the shaft in even layers.
Don't try to cut straight through or you will split the top layers as the saw come out the bottem side.
I've been doing it with Easton,Goldtip,and Carbon express for around 15 years with never an issue.When I first started shooting carbons you could by an arrow saw kit from Apple that contained a hack saw blade.
litigation by people that couldn't/wouldn't read the instructions probably saw the end of that kit.