i bought my locking gas cap i installed it but i pulled of the plastic ring (the one that u can hook on the gas cover)off of it thinking the stock ring would fit but it doesn't. so i put the plastic ring back on the locking gas cap but its stretched out any ideas to maybe shrink the plastic back down.

 

My first thought would be a heat gun might allow you to get the plastic to reform slightly. However you're likely better off not installing it.

 

i tried using the blow drier. its not much of a big problem the cap works just fine its just now i know i stretched the black plastic ring. i just wanna shrink it back down a bit

 

The blow dryer is not going to get hot enough to make it pliable...
Heat gun - Wikipedia, the free encyclopedia

Also, make sure you give the cap some time to air out before putting the heat gun on it as you may ignite some vapors otherwise.

 

i just place the locking cap on the roof while gasing. it reminds me of my old 90
civic i had like 20yrs ago and those were good times. in fact my entire FitS
reminds me of that car. that's why i like it so much.