Any way to reduce hole on vanity unit for basin waste fitting?

[Joe Fixit]

Then you'll need a flange/washer to both cover the enlarged hole and act as a clamping down flange for the waste fitting assembly to grip upon.

Thats what I was thinking but struggling to find any products which would be able to fit the pipe (38mm) fairly snuggly so the back nut can tighten onto it whilst the rest of the plate/flange is wide enough so I can secure it to the vanity unit (hole size 75mm)

 

[Scally-Ho]

I really do not like the way a waste fitting is being used as a holding down device for securing the bowl to the base unit. That is a lot of strain and tension on a fitting that was designed initially for directing used water away from the appliance. Since the foreign lot have been given access to our GB Plumbing, standards have fallen to far lower standards than I was raised to accept

 

[Joe Fixit]

This is the sink we got

 

[Scally-Ho]

Oh, I see! A Yankee product without any kind of overflow or clamp-down fixings. That explains everything including the 100% plastic waste fitting. I wish you good luck with the installation. British Standards exist for a reason and now that video has demonstrated why they exist.

 

[Joe Fixit]

Came across this. Sizes should work. I was hoping to find a plate/flange which I can screw onto the underside of the vanity so wondering if this and using ct1 or the like to hold it in position could work?