I talked to a cousin yesterday. He told me "plug is inserting rubber on the hole. patch is like band aid. the problem with patch is repair is in the inside. but you tire still has a hole on the thread/outside. the thread are running on wet roads tendency is for water to seep thru the un plug hole there by causing rust to your steel belts which are sandwich between your patch and rubber threads. hence better plug kasi the seal is done inside and out. therfore water wont seep thru the hole. steel belts wont get rusted.".
So with cold patch inside only, won't it rust the steel belts since water can go inside without any plugs?
I know if I'd have cold patch done, they would pull the plug with pliers since as Glenn_duke mentioned, there is an extension inside they can't just grind it since it would be more difficult.
Also look at following.
What shop can do the middle one here (it uses a plug with patch in one like in the following)?
How To Properly Repair a Tire - YouTube







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