Right now I use wood for my model on all round baits.
I do my mold making by using 2 halves to my model,
rather than trying to find a center on a one piece model.
It's really very simple. I have learned how to attach
2 pieces of wood together on the ends, and turn them,
when separated, I have 2 halves for a model exactly
the same.
As far as using rigid PVC foam boad for a model, I use
2 pieces of equal thickness and spot glue them together.
I then cut out my model, sand and shape it the way
I want it, separate it and I have an exact center for
making my mold. In both cases I take a piece of aluminum
tape and put it on a piece of very smooth hardwood, that is about
1/4" thick. I put one half of my model on the tape using
screws from the bottom side. I then build a box around the model.
When this half of the mold is made, I glue the model back together,
clean up the seam, and pour the second half of the mold against the first.
Lincoya, gave me one piece of the foam board and I made
a couple of baits out of it. The local sign company here gave me
a few scrap pieces, I use for models for molding.
The sign company uses it because they can drill and tap it.
And comes in many differen't colors.
It will hold a eyescrew without any pull out. Lincoya and
I tested it.
They also use Lexan and have some scrap pieces of that.