For those of you useing screw-ins or adaptors, what do you prefer to hold heads? Thanks for any and all.

little rubber O-rings from my training wheel days (don't think they are specifically for wheelies) or string wax once it gets cold enough around here.

I use a broadhead wrench and get them really tight.  I'd not recommend using an O-ring or something similar.  IMO that would be weakening the system at the point that is already the weakest link.

o-rings, they allow me just enough play to align my blades the way I like them.  This helps me double-check tightness by simply looking at them.

Just a fuzz of blue loc tite. IF i know I'm not going to be changing regularly.

Teflon pipe thread tape works really well and its not a pain to remove later.  If I am worried about broad head alignment then I use dental floss at the base of the broad head. Just a wrap a bit on and tighten down, it compresses well and leaves very little wiggle room (weak point).  If its not just right try a little more or less till it is right.

Of course you can avoid all the mess of broad head alignment with aluminum arrows by heating and moving the insert a bit, my personal favorite method when I used em.

Thank you for the opinions,Slowbowin, could you elaborate on why a o-ring would weaken the system. Thank you.

Second the teflon tape.

Even compressed the O ring leaves a slight gap between the head and shaft.

string wax.

i am with john string wax all the way    
wolfman

5 mm lock washers work pretty well.

The joint between the base of the adapter or ferrule as it goes into the insert is one of the weakest spots in the head, and often the first place it bends.  Adding an O ring like Dan said gives it even more play and leaves it even more susceptible to bending than before.

The wax and thread tape suggestions are excellent ones.

Been using point locks, "O" rings for years. never had any trouble .

Teflon tape here as well.

It seems to me that the only way to not have a gap is to heat the BH adapter or insert and index the head the way you want it. Maybe I'm missing something but the ferule is either bottomed out fully against the shaft or it isnt. If the head isn't in the right position when bottomed out, it either has to be heated as above or something like an O ring or teflon tape used. Either way, theres still a gap, but the head is at least tightened down securely against something. I just dont get how an O ring leaves a gap but loc-tite doesnt. I use the O rings and haven't had any problems.

After re-reading my post, I realized that I was talking only about indexing heads a certain way, and thats not exactly what stripe was asking. My fingers were in gear but my mind wasn't. My bad.....  

To keep your broadheads from loosening off, and still be able to remove them without a fight, try putting some silicone sealant (like the buthtub goo)
on the threads-just a little bit.

ONce the silicone sealer has "cured," its rubberlike properties will stop the broadhead from coming loose, but when you need to remove the BH, the rubbery sealant will tear loose without the fight that lock tite, etc can cause.

This "trick" works for all screw in assemblies-its an old moto-cross bike prep trick (and probably drag racing, mudbogging, etc etc)

If you don't like this idea, finger nail polish makes a great removable thread locker.