Yeah, a good close fitting washer with the slightest amount of solder will hold any wheel on, any scale. I wish DuBro would rethink their wheel collars. I think wheel collars could be made of materials similar to propellers, nylon reinforced with carbon fibers would be enough to hold a wheel on. An extra note, I have ground collars almost dangerously thin just to make them thinner and lighter. But I think you're right Jennifer, a little extra time and work, and a washer and solder is all one needs, and it's lighter.