I was told it had the major upgrades done by the last owner, I had a poke round a moment ago, quite literally, there’s a 25mm hole in the casing, and when I had a feel about, my finger looked like this…
It came out of that hole.
That is not a conclusive test unfortunately. The blue gloop is the grease used to pack the Mk1.5 compensators, which I suspect your car either had, or still has. If the former, then there's every chance that the fitter of the new Centra compensator failed to clean the housing properly. If the latter, then you may need to investigate further I'm afraid.
