Gopro steadycam

I wanted to get better shots on my gopro so I designed this.The design is NOT fully functional as the bearings in the part called glide cam center block do not turn well. This could be fixed by using bearings from amazon. Link:https://www.amazon.com/Lictin-Bearings-Rollerblade-Component-Skateboards/dp/B073XLXZKG/ref=sr_1_1_sspa?ie=UTF8&qid=1510004515&sr=8-1-spons&keywords=bearings&psc=1
The bearings are not pre-made bearings they are 3D printed ones built in. The balls in the bearings are 6 mm