Hi. Any tips to stop the doser 2.1 squeaking? I'll clean everything with soap and warm water, dry, reassemble. It will be quiet for a day, then it starts to squeak. It is running on speed 0, doing 145*0.3ml/day. I recently tried running a pump manually for a few seconds without a blue cap on and there was no squeak at all. Put the blue cap back on, squeak. So I think the rollers are rubbing against the blue cap, as I get a slight white dust/residue on the inside of the blue cap. Is it ok to try applying a little silicone in my case to the underside of the blue cap? I can hear the squeak from the other rooms in the house. And it's annoying because I know it can be quiet. Video with sound posted on the GHL Facebook page. Many thanks.