I tried to squish the gap very small sometimes but ended up kinda make the the jump ring an oval shape oops or sometimes even breaking them (I’m not very good at estimating the needed pressure) but those are some nice tips I’ll use next time with jump rings thanks 
Also in case anyone was curious about the keychain thing I mentioned yesterday
This is the type of keychain that’s inside/attached to the orange fox thing I showed earlier,
just place the magic ring inside the gap and continue working (for example when you have a 6sc magic ring → have the keychain part at your last stitch and kinda just ignore it and work over it, work into the first 3 stitches (could be increases, could be something else, whatever you need) then make sure there’s the other one of the keychain sides, hold it against your last stitch and work over it to the next stitches and work in 3sc again