Can those plastic push clips that hold in the bumper on the bottom be re-used? my dad seems to think once u pop them out, u have to get new ones.

 

Yes, they can be re-used.

Often people have problem with poppers because when they take them out, they break. This is a common problem when the poppers have been "seasoned" - meaning that they have been exposed to the elements for a long time and have become hard and brittle, or if they keep re-using the poppers.

Besides that, I think the tC uses plugs that have a center post. This are much more reliable and easier to reuse. Either way, your answer is yes, they can be reused.