ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Has anyone out there safely removed and reattached the platter ribs on a 4002? I’ve snagged a couple of cheap 4002s in otherwise mostly reasonable condition but the platter has a bunch of marks and the coating is flaking off in a few places - I’d like to remove the ribs and maybe find a local place that does aluminium finishing to clean it up and perhaps anodise it.
I had a little poke around and I couldn’t quite tell whether they’re press-fit or glued or what, and I didn’t want to pry too hard and damage them, so if anyone knows, I’d greatly appreciate it.. I assume B&O won’t sell you only the ribs or platter restoration part of the 4002 upgrade package, and likely not at the kind of price that wouldn’t nearly outstrip what I paid for the decks 😅
I suppose in a pinch I can mask off the ribs and then carefully strip the clear coat and respray with a small airbrush, but nearly everything else in the turntable seems to be relatively easily disassembled one way or another so I assume there’s a way to do it.
Although, even the banged-up platter on one of the decks looks better than the other one - I’ve already thrown it out but it was, as far as I could tell, a circular glass mirror that someone had frosted strips onto.. like, what the hell? That turntable looked like it had been stored outdoors in a shed for decades, possibly after no longer working because the idiot owner replaced the platter with a freaking mirror.. now I’ve got to find a replacement original for it on eBay or something and most likely pay through the nose 😐
Hoping to get the better of the two cleaned up and restored in time to give it to my father for Christmas, since he always wanted one back in the 70s but as a schoolteacher it’d have cost him the equivalent of about 3 months’ salary. I can’t exactly afford to get him a 4000c, but an eBay special slightly busted 4002 and a few weekends worth of soldering and cleaning and adjusting, that I can do 😁
Quite frankly, the ribs are one of the poorer design decisions B&O made for that turntable and reversed it in later models. The platter you are referring to was manufactured by me with a matching weight and rubber interface layer and was a popular accessary with my Grado Signature cartridge modification in the 1980's. Glass platters are not uncommon on quality turntables even of today. The etched diffused ribs allowed the record size detection to continue to work.
As to your question, I believe the ribs are inserted and glued but have never tried to remove them. I would expect that would not survive that process.
Hi
I have had a similar problem with a platter from a beogram 4xxx, sad I can´t remember which model it was.
The subplatter (where the belts runs) was not glued to the top aluminium platter with the ribs, there are some models with this seperated platters.
So the ribs are inserted from the top of the aluminium platter and melted to a nearly flat stucture at the backside of the aluminium platter.
There I cutted this melted part away and pried the the ribs out from the backside.
I sanded the platter with some 600 -800 grain paper on a cordless drill with an attached woodplate where I could fix the aluminium platter with two countersunk srews. The screws will make a little mark at the holes for the ribs but the ribs are covering this mark if you tighten the screws not to hard.
After sanding I gave it layer of clear coat and pushed back the ribs in.
They are pressed fitted and must not be glued in place again.
Watch out before how the ribs are mounted there is and out- and inside.
Here is a picture from the platter without the ribs, sadly I took only one picture ;-(
So the only thing that is needed is a way to seperate the subplatter from the alumium platter...maybe hot water woul help, I don´t know.
I wish you good luck!
Kind regards
Christian