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The only place for a coil spring is up Zebedee's arse
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Unfortunately for me it was only after fitting the X8R "o" rings that I saw their hit and miss successes on the web.
I've had an air leak for a while, mainly when it was cold outside.
I have isolators from the output side of the vale block for the air bags so knew it was the block, which on stripping found the diaphragm damaged.
The car now fills a lot quicker but I have found leaks on virtually all of the top solenoids with soapy water and the car drops in a few hours
I stripped some of the worse leaking solenoids to see if I had caught/twisted any on the seals but they are all fine.
I have now sent for a set from 4X4airseals who were originally Landyair, has any one had any issues with their kits ?

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It's usually the very thin ones that go around the plunger spindle that leak. The last couple of valve blocks I've done I've not split the solenoid and left the originals in place. I bought a batch of 12 used valve blocks a while ago and have been slowly working through them. The first 3 or 4 I used the X8R seals and had the odd leak, but the last couple I've used the Landyair ones although I haven't changed the thin ones at all on them.

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Thanks Gilbertd,
In hindsight I wish I'd left the solenoids alone but I thought that I was doing a good maintenance rebuild because as far as I know the seals have never been changed in the cars life. It's gone through two sets of air bags and a few compressor rebuilds in our sixteen years of ownership but no issues with the valve block.
Fingers crossed the Lanyair ones will do the job.

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Car now staying up overnight after fitting the 4X4airseals (Landyair) O rings
I'll hold my hands up and admit I did find one of the rear solenoid small thin seals that I changed not seated properly. As you (Gilbertd) said I doubt I would disturb them again unless I really had to.
I did however measure the thickness of the O rings and apart from the thin internal solenoids O rings being the same size, the X8R ones were approx 1.53mm against 1.73mm for the 4X4airseals (Landyair) seals.
If I have to do this again in the future I will definitely use the slightly thicker O rings.