Plug (pasak) then Patch (tapal) on tire?

[k_leos]

My concern was due to reading this article specifically the paragraph:

https://www.topgear.com.ph/features/...a1219-20170528

"7. Avoid vulcanizing shops that use the sundot method. The traditional patching inside your tire lining is still the best way to seal a puncture. Some shops today offer a faster approach by inserting a seal with a sharp tool through the puncture from the outside without dismounting the tire from the rim. Though it may seem like a great convenience, it can actually damage the steel belt that keeps your tire's structure intact. I learned this the expensive way when I resorted to this method a few years ago. My tire was pretty new and two days after the job, there was a considerable bulge where the seal was. It was apparent that my tire needed a replacement. Sundot never again!"

I'd like to understand mechanically how the plug can damage the steel belt such that in 2 days, he already had bulge in the seal of his new tire.

This is part of a tire.



Now imagine you push a screw driver into the hole, would the belt and ply simply have clean holes or would the section of the belt and ply be pushed outward such that there is slight separation between the tread and belt/ply? If you have spare tire that you don't need anymore. Can you try pushing screw driver in a hole to see what would happen?

This was my tire with a hole punctured by a screw.



After the technician pulled out the screw, he inserted a screw driver all the way in (making bigger hole so the plug can fit).



Then put the plug.




I'd like to know what kind of pushing can really damage the steel belt as the above article detailed. Want to analyze why it happened to his belt such that after 2 days, meron na bulge. I'd still use the tire for the next 10 years (it's also somewhat new, look at the tread) because I seldom use the cars. Hence I need to know the details of how damage to steel belt can really occur from plugging repair. Salamat.