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@Jonny69
The weird 4-way channelling I was getting in this post. The water distribution was dreadful and on closer inspection was spraying everywhere. When I took it all off for a closer look, I also noticed the shower screen was being pulled almost flat against the dispersion plate like @giles337 described.
So, fix it time. The holes in the OEM dispersion plate are actually tapered from 3.5mm on the back to 4.5mm on the shower screen side. The holes are also a bit further away from the edge. That meant not drilling down the same holes because they were too close to the edge. I considered trying to find a 3.5mm slot drill, but decided a centre drill would be stiffer and the 60° taper would do the taper in the hole. Result below.
To deal with the shower screen, it needs a shim under where the bolt goes through to stop it pulling down. I’ve got an M5 washer pressed into a slight cone shape, a stainless M6 washer which sits either side of the divot on the shower screen and a brass M6 washer. The stainless M6 washer works best as the brass one is too thick and the M5 one is plated plain steel so it’ll rust.
Finally, swapped the countersunk Philips screw for a stainless Allen-headed one from my stash.
The result is a really good, even shower of water which doesn’t photograph well. Proof is in the pudding and I’ll find out if it’s worked tomorrow morning.
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