toggle strength

[benz]

I use toggles from time to time on my boat, and wanting to use them more (cheaper and lighter than shackles), I began to wonder how much force they're subjected to when loaded. Has anyone calculated this? What percentage of the load on the halyard, say, translates into a bending force on the (getting technical here!) sticky-out bits that the loop rests on? If anyone cares to do some destruction testing, I'll gladly spare a few toggles (I turn them myself out of hardwood on a lathe).
Ben