Gen crown and tube not matching up for a 6538 build

[devilva]

Im having PB mod a couple of big crowns for me (7924, 6538) and I bought a couple of gen parts for them, Brevet 8mm Crown 800/0 and what I thought was the matching tube, the 24-8000.

He's opened up one of the tubes and basically said the tubes are too small for the crown. But he tested Yuki's tube and it fits the gen crown. I guess ive f**ked up but could anyone tell me what tube's fit the gen 8mm brevet crowns?

Heres a couple of quotes from PB, if anyone could help out it would be appreciated.

"...the prob. It's the tubes...

They don't mate up with the gen crowns.

The holes inside the tubes are too small for the thick crowns.

I'm not sure what model is needed..."

"Here's the prob.

The ID of the tube is too small to accommodate the tube section of the crown.

However, it appears on the surface that the thread sections of both mate up."

Thanks guys...

[stilty]

I'm not sure with that series, but I know with some of the earlier 600 series tubes, they need to be broached after installation in order to fit the crown.

[freddy333]

When it comes to vintage Rolex tubes, Stilty is exactly correct

[devilva]

Thanks for the help guys... so many pro's over here. I'll pass this info on and if all goes well, give you guys a look at the end result. Ive got 3 big crowns and 1 5508 being done. Gen tropics and crown/tubes, yuki cases with eta's and ndt dials modded by the great man himself. Its been quite an adventure already, a lot of ups and downs but the project contiunes... Thanks again!

[rwgforumfan]

Any update on this project?