Hi...
I've been using Bucket O' Mud and the thimbles just pop right off after soaking in water for less than a minute. I was skeptical but I was totally amazed after the first one came off so easily.
I've also been using the Vin Pin for my dimples on the top. Makes a perfect star pattern.
I really like my thimble mandrel in case you couldn't figure that out...
Have fun.
Sue