Wheel Sets Painting Mask 36" for weathering model train N scale wheels

I got tired of cleaning wheel treads after painting and weathering wheel sets. Therefore, I designed this mask allowing for spray painting or with a brush. This mask fits N scale wheels of Micro-Trains line (003 12 010), which are also often used for HOn3. However, it might also work for other wheel sets. It can hold only 4 wheel sets to ensure a tight fit around the wheel treads and some variations among batches.