Screwing into the cyclinder

[Mr Blobby]

I was surprised, and rather disappointed to find our plumber had screwed into my lovely Panasonic cylinder to fix pipes.  

 

Googling around it seems this is common practice to fix into the cylinder so I'm much calmer now.  However, the clips are all loose, suggesting the screws have not threaded onto the external skin of the tank.  I have a box or short wide self tappers on site that would probably have been far more effective but its too late now.

 

Any thoughts on this?

 

[LaChab]

I had an idea that Panasonic used Oso cylinders, in which case it's possibly not a good idea to use any screws as Oso use vacuum insulation, and state "no penetrations".

 

[JohnMo]

If its foam insulation no issues, if as said a vacuum insulated one, bang goes the insulation

[SteamyTea]

Easy fix, 25 quid.