OK, so I put an endoscopic camera through the tube holes and couldn't see any stray on ring. I connected a hose pipe to the vac and a smaller hose to the hose pipe. I did remove some very small fragments of plastic but no one ring. I swept the floor and sieved the dust and found about a third of the o ring. After researching the other forums I found a thread where a Porsche mechanic stated that small fragments of plastic would not do any harm in the bottom of the casing so I decided to put all back together again. At the moment she is running lovely. I have taken her out for a decent run.
I k ow that everyone will condemn me for taking the risk but it is done now.
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