Difficulty installing Grohe faucet

[mreisner]

Trying to install a new faucet onto a new sink and it has this weird for lack of better term nut to tighten the stem down onto the hole in the sink. It's a two-piece plastic thing on the inside it almost looks like a castle nut like you would find on a tie rod end. It gets just about tight enough and then slips repeatedly. Installing it according to their assembly video and it still does it. There were no instructions with this faucet somebody lost it along the way although it is new. Anybody had experience with them and can tell me what's going on or can recommend what size regular nut to get I'm assuming it is metric as it is a European faucet. Thanks.

 

[scooby074]

What model is it? I wonder if you are missing any pieces? Last modern quality faucet I installed had a thin nut with 2 screws to tension it. Instructions can be found here, might help :https://www.grohe.ca/kitchen-faucets/single-hole-pull-down-faucets-list

 

[carlaisle]

Probably not your exact model, but the manufacturers tend to go with the same basic strategy. What do you have and what are you missing?

 

[mreisner]

This video shows the connector that I have, doing it as shown and still slips.

 

[rlitman]

That video leaves me with more questions than answers. What's the blue part for? Is that what's slipping for you, because he seems to do the tightening with the white part.

 

[rlitman]

This video shows just the blue part on a different type of install. That seems to slide over a thread and then tighten. I think your issue is somewhere in the relationship between these two pieces.

 

[Kaizen]

looks like the blue part moves at the end of that video. is that what is slipping or the white part? is the faucet tight? maybe some kind of self torque thing

 

[PCustoms]

Is it cracked?

 

[mreisner]

Finally got it, had to drive it from just the blue part not from the white part and apparently that James it tighter on the threads and seems to be holding well now. Still kind of a dumb idea in my opinion could have just had a big plastic not threaded on there even though it's fine threads it doesn't take that long to spin it up there. Not sure about long-term longevity as it is a fairly tall faucet