Well what i use to do is get a cutting board and knife an make it the same size of the cap. next you can take some superglue and glue a toothpick to it to grab on to. It takes a little time but if theirs no other way this should work. also putting you yo in towel fresh out the dryer will help loosen the caps. makes the metal expand for a little wile and releases the caps easier. This takes some time so i suggest you keep you caps out a lot if you use this method. also mind that fresh brand new caps aren’t as easy to take out as one that have been used for a wile. Still i strongly suggest getting a suction cup. Hope it helps and remember keep it spinning.