sent you a PM rich.
the vega duplicator is AMAZING. well worth the money. We made lexan templates for the different size slammers and custom baits. It allowed us to turn out blanks very quick.
If you take apart a slammer and sand it down you will find a large amount of wood filler because they use furniture grade pine. Still a great bait.
i have added belly weights to them. I found it not really necessary. You are just making the bait heavier to throw. You are better off playing with the size and angle of the lip if you want the bait to dive better.
IF you still want to experiment with weights in the slammer drill out a hole and use egg sinkers so you know exactly how much you are adding. To finish the hole use a waterproof sandable wood filler. It is important to use the right filler so that part of the bait will finish right.