I am currently helping my brother who is in the process of making a master for a Proton Pack. He is making the model and I will be making the mold so we can make a set of copies out of fiberglass. We will probably make more than we need so we need the mold to last for awhile with several pulls. We will be making copies with fiberglass and using a fiberglass mother mold. I am not familiar with the differences between rebound and stroke other than one is 1:1 and the other is 10:1 and the cost difference. Can anyone make an argument that the rebound is worth the cost? The way we will be making the mold will require a brush on method. I hope i provided enough information.