I got mine from Jacobs. The collared ones are tough to get the barb to fill.
If yall run across these molds Id like to get 1/16 and 1/8 ones!
I use a little JB weld to fill in the barb section which works well. If you want to pour with the barb it easily can be scraped out.
kjackson LIKED above post
Jacobs for sure.