!t sure is, but takes a little time & patience. Here's something I have been working on;
My link and here's a finished bait; jig & screw . A friend tried to modify some jigs that did not have a weed guard. Drilled out a hole with a 1/8" bit and then inserted the spring like you see in the first pic, securing it with epoxy. You can use anything smaller than that 1/8", but I would not go larger. A bit of a PITA, but it did work. Then later I purchased a few screw locks from Do It to try another method and using epoxy or Super Glue Gel works pretty well to secure them in the base pin hole of any Do It mold. Assuming you already have a mold, insert the base pin and pour them while the pin is in place. Once the mold cools, pop the jig out and insert your keeper, gluing it in place. Then paint and dress the jig as desired. If you are gonna modify an existing jig, follow the prior instructions.