Suggestions on a post it (hard to bit)

[Equi]

Haven't read all the replies so apologies if I'm just repeating..!

My friends horse is a pain to bit, he also has aural plaque. She has a bridle with clip cheek pieces, unclips the left hand side (standing on left side) and gives a treat whilst putting the ears through headpiece/browband, and then another treat to open mouth and slip the bit in and just easily clip it on. It's really simple, even I can do it and things like that really annoy me!

It's a pain but I think with him it's really down to the aural plaque which unfortunately should just be left alone.

Currently the bridle is put on like a head collar, then the bit is put in with the clip bridle. The issue has been he wont let the bit go in - he claps his mouth and will toss his head and pull back so hard he has broken bridles etc.

I saw no evidence of this today..so i have given owner the advice of 1) don't tack in the stable anymore...tack in the arena where he is not confined. 2) do some "touch" work before bitting so he knows whats coming and 3) have his back looked at cause i sensed some pain in his pelvis area.