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I had a Storage with Pipes in 30mm inner and 34mm outr Diameter where i needed to deal with uneven floor.

In this construdtion you need to put in a 8mm M8 Hex Bolt and in the inner part a 8mm Nut.

I had different nuts for M8 so im not sure if yours will fit, mine have a Wrench Size of 13mm.

i adjusted the feeds with M8 Bolt on ground and fitted it with the spacers for stability issues.

Then putted the outer Part on it and pressed together and then turned it to lock the Bolt.