[Karren H]

I've taken domes that were too wide..... heated them with a heat gun or over a stove till they become soft and bent the edges inward till they are the right size.... you have to be carefully they don't get too soft or you melt them... and wear gloves because they do get real hot.... like wise I have taken domes that were too small and flared them out a bit till the work for me... allows me to get a bit more use out of them...