Homemade Power Jelq Device Question

I have the original power jelq device but I think the rollers on it are way too firm to the point that there is no give from it. It seems like those rollers don't conform to the shape of my dick AT ALL. The foam rollers from the homemade model looks a lot softer and comfortable. You guys think it's possible to just swap the original rollers for the cheap foam rollers found at lowes?

Here's the homemade model. I wish I saw this way before I bought this device a while ago.

Homemade Power Jelq, a Jelq Device

I think the rollers should be more like hourglasses so you have a natural indentation.

That's true. Have you tried the foam rollers from lowes? I may just make a homemade one just to test it.