OP, I looked up the feeder mentioned in a previous post. PRE-VENT Feeder
I am pretty sure that it would be a good investment if your horse bolts his feed. We ALL want to keep our horses as inexpensively as possible, because so many of us "Horse Addicts" are also a little "horse poor."
HOWEVER, if you run the numbers, $59.95 + S&H is cheaper than-
1) the Vet bill(s) from choking;
2) time spent on training your new replacement horse;
3) price, driving to pick up and/or delivery of said new replacement horse;
4) recovery of your current horse, that you can't "play" with during recovery.
Take these in ANY order. I have owned > 30 horses in 26 years, so I kinda know about this, but not because of any horse deaths (other than old age.)
It's just a little food for thought, pardon the pun.