Obviously this question is for companies that do not make practice tips. What works good to keep the blades from deploying on a mechanical head without throwing off weight or balance? I'm just looking to take a couple shots into my field point target to verify their flight characteristics. I also don't really want to dull the blades on a head simply for this purpose but I will if I have to. I'm in possession of only one three pack right now so that's the reason for me being stingy about the blades. If I had more tips on hand, there would be no issue with setting one back as a practice tip.