Sink waste with no centre screw, how is it attached?

[smp50]

Quick question - I have a sink waste I want to remove but there's no centre screw like I'd have expected. In its place is just a small flat piece, almost like a the head of a rivet or something. I can't lever it out and from underneath I can't see any screw/nut/bolt or similar. Any idea how its held together and how I can remove it without too much damage?

Thanks,

 

[kbdiy]

Can you post a pic? I would expect to see a large nut underneath. Undo that and push the waste out.

 

[smp50]

Can you post a pic? I would expect to see a large nut underneath. Undo that and push the waste out.

I can't take a pic at the moment, but it's exactly like a normal sink waste with a centre screw on top, except the "screw" has a thin, flat, featureless head instead of a normal screw head, and from underneath there's no sign of nut or anything.

 

[DaleRCL]

Is the 'rivet' head some sort of cover you can pop off to get to screw head?

 

[bazdaman]

You will have to post a pic, they also have 2 piece waste which you have to stick a screwy through the drainage holes to secure then twist the bottom out

 

[smp50]

I can't seem to flick the "cap" off to find something underneath it, and the view up into the underside of the waste doesn't reveal any screw or nut. I'll just cut it out if need be but would like to do it gently if possible.

 

[stardanny]

Look like a worn screw head or screw head grinder out.

Destroy it by breaking off the black plastic bit at the bottom of sink.

Replace it with new combi waste fitting.

Daniel.

 

[smp50]

Destroy it

Yes sir.

 

[denso13]

 

[smp50]

It's done - I used a hacksaw horizontally through the under-the-sink parts and right through the middle "bolt". The post mortem revealed no nut, no thread, no clue as to how it was actually held together. Strange!