It seems that the new OneBlade razor will no longer work with a Gem blade just by de-spineing it. You have to clip the blade also or it moves around the head. They made the space bigger that holds the blade. You have to buy a tool like this one:
https://www.amazon.com/Capri-Tools-21050...ool+5%2F32
https://www.amazon.com/Capri-Tools-21050...ool+5%2F32