I havent used them but have checked them out, if you could get them locally they'd probably be something to try, howeverif you had to buy them plus pay the shipping costs then IMO a guy could probably find something just as goodina small screw at any local hardware store that would work just as good andbe cheaper

I've came up with several ideasas far as inserts/insert weights that would work good, some are pretty simple ideas and someare so elaboratethat they would require my making them completely by hand(I have access to a machine shop), but the easiest I've came up with so far to add weight to thefront of the arrowis to simply switch to 125gr tips

I'm going to be trying some different things myself in the near future to see how they work, I'm happy with the weight of my arrows but even though my FOC is decent its not as good as I'd like it to be