The chatter come from defective switch, lubing the stabilizer won't make a difference. What you want to do is open the switch up and clean the inside to make sure everything is working properly.
Here's my lazy guide on how to open the Matias switche:
lol if that still doesn't work then you might have to either:
1. Call where you bought the keyboard and get it replaced.
2. Buy a single switch off someone and get it switched yourself using the above method.
Good luck !