Give a metal thimble a whack with a hammer to make the big end oval. It will fit your finger because your finger is oval not round. I do this to all my metal thimbles. Get a cheap metal thimble and give it a try. I love the Wonder Thimble, it's my favorite of all and I have many different types of thimbles even the custom fitted one. Not worth the money to use to me, but it's pretty to display.