Originally posted by Equinebehaviorist
The roller mouth can have several purposes: 1)the roller acts as a toy for the horse to find comfort in fiddling with, 2) the roller lifts up onto the soft palate when the reins are engaged and creates a greater degree of discomfort which to some = a greater degree of control, 3) if the roller is copper, which it often is, the combination of the steel mouth peices and the copper roller help encourage salivation which in turn encourages a softer mouth.
YLL. wasn't what I said about the roller snaffle correct? Or am I missing something? 
Job 12:7-10 : But ask the animals and they will teach you, or the birds of the air, and they will tell you; or speak to the earth, and it will teach you, or let the fish of the sea inform you, which of all these does not know, that the hand of the Lord has done this? In His hand is the life of every creature and the breath of all mankind. (NIV)
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