Problem w. fork reassembly

I have a problem reassembling the forks on my ´02.
Getting things apart, putting new seals etc wasn´t too bad following the WP manual i downloaded here at UHE.

My problem is simply in tightening the comp valve assembly to 25NM. I get to about 0.5NM before the cartridge starts spinning. The manual doesn´t speak of any special holding tool, nor can I invent one.

On disassembly you are supposed to grab the piston rod and "bend" it to the side creating enough friction to be able to loosen the comp valve assy. That worked out somewhat ok, but using the same method during assembly? Not a chance! Not even with a helper. Don´t want to damage anything, so maybe I am being too careful? I kept the rod inserted not to deform it, but that gives me no leverage.
How do they do this in a production line?

Everything is clean and lubed, threads are 100%.

I am at a loss.
Really need some help on this one please.

Nothing.
The comp valve assy screws into the cartridge and that´s it.
You can´t see it since the cartridge is hidden inside the lower stainless steel tube. I am not talking about the comp adjuster, but the whole assembly which screws out the bottom using a 19mm socket.

Hard for me to explain, since I´m no expert. A look at the WP manual explains it far better. These are the upside-down forks of ´02.

UHE SAVES CHRISTMAS!
I knew you would come through! Thank you all!

Here is what I will do:

Since I feel using an impact gun seems, well, brutal, and probably requires the experience of what ~25NM "feels" like, I will try Taffys method first, still using a torque wrench.
I like having full control. Thanks Taffy.

If for some reason I still end up using a 3/8" impact gun, I´ll be sure to get (or make) a flat faced (no lead-in) socket and for sure not a 12 point one. Thanks for that advice VIKING.

So, you probably saved me at least a VERY long drive to the nearest shop. But most important I learned without breaking something first.
Which in turn yet again proves why donating a few bucks to UHE is SO worth it!

I will report back with results after the holidays.


Thanks
Pete
.

Tried your method, Taffy. Didn´t have a 100kg buddy handy, so I compressed the forks with a ratcheting cargo strap. I had to go almost all the way in before it held, but then it worked great. Thanks!

Here´s a pic of my set-up:
Real easy to loose a finger upon release though. Hence the second blue strap...