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Rust on Ortofon RMG 212 - Reblue ?

Discussion in 'Turntables' started by klipschbro, Nov 30, 2018.

  1. klipschbro

    klipschbro New Member

    Messages:
    18
    Just picked up an Ortofon RMG 212. There is a rust spot on the counterweight. Has anyone refinished theirs?

    Is the counterweight Brass or Bronze?

    Has anyone sent theirs out to get hot blued?


    It looks like I can remove the blueing with white vinegar, scotch brite the rust and re-blue with either of these solutions:

    BROWNELLS - OXPHO-BLUE® CREME

    Birchwood Casey Brass Black

    sQoSfsx.jpg


    https://www.firearmstalk.com/threads/using-gun-bluing-on-brass-w-pics.105816/
     
    Last edited: Dec 5, 2018

     

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  2. Freddymac2

    Freddymac2 Super Member

    Messages:
    1,862
    Is that arm a 16" monster? What cartridge do you run on that? I do not think a blueing for brass will work on steel. The cold blueing's I have used, did not hold up under use for very long, and they were never even close to hot blueing.
     
  3. klipschbro

    klipschbro New Member

    Messages:
    18
    This is the 9" arm. The 12" is the RMG 309. I am currently running an Ortofon SPU headshell with an Ortofon F15E. A total mismatch on compliance. Shopping around for an Ortofon SPU and SUT. Maybe I will just send it away for hot blueing. I am unsure if its brass or bronze, it definitely is not steel.
     
  4. Freddymac2

    Freddymac2 Super Member

    Messages:
    1,862
    I have a RMG 309 on my bench, I will have to look at it more closely. Bronze does not rust, so it is on the surface only.
     
  5. totem

    totem AK Subscriber Subscriber

    Messages:
    5,356
    Location:
    Vancouver Island
    Have an RMG-212 that has a tiny spot or two of discolouration but not as noticeable
    as on your counter weight.

    That set screw within a set screw on the counter weight was an Ortofon tradition and the reason
    the shafts get all marked up from unknowing users.
     
  6. klipschbro

    klipschbro New Member

    Messages:
    18
    The 2 screws almost got me. While going over the tonearm, I removed the counterweight. I was definitely the first one to do that, as there was only one mark on the shaft from the set screw.
     

     

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  7. klipschbro

    klipschbro New Member

    Messages:
    18
    I'm going to try to cold blue it. Does anyone know how to separate the pieces of the counterweight?
     
  8. klipschbro

    klipschbro New Member

    Messages:
    18
    IMG_20181204_183733.jpg IMG_20181204_183844.jpg

    The brass screw does not seem to do anything, and the only photos of the thing disassembled was on www.goldenageaudio.com.au. which is now offline.
     
  9. totem

    totem AK Subscriber Subscriber

    Messages:
    5,356
    Location:
    Vancouver Island
    Off the top of my head I thought the bottom knurled ring unscrews?
     
  10. klipschbro

    klipschbro New Member

    Messages:
    18
    Does not seem to budge and I do not want to force it.
     
  11. klipschbro

    klipschbro New Member

    Messages:
    18
    I found the photo via wayback machine. It does look like the owner of Golden Age Audio passed.

    7770336_orig__.jpg
     

     

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  12. klipschbro

    klipschbro New Member

    Messages:
    18
  13. klipschbro

    klipschbro New Member

    Messages:
    18
    I got it! Brass screw counter clockwise. It took a little force to crack. I will be re-blueing soon and will update with the results.


    IMG_20181207_235033.jpg
     
    Grbluen likes this.
  14. cafe latte

    cafe latte Active Member

    Messages:
    378
    Location:
    Ravenshoe
    Cold blue get it de greased and hot ie boiling water and cold blue can look amazing. On a gun it wont be as resistant (cold blue) but a counter weight on a turntable that lives in the house just cold blue will be fine if done correctly.
    Chris
     
    klipschbro likes this.
  15. klipschbro

    klipschbro New Member

    Messages:
    18
    After soak in white vinegar and polished with 0000 steel wool.

    IMG_20181208_162653.jpg
     
    Grbluen likes this.
  16. klipschbro

    klipschbro New Member

    Messages:
    18
    This is the result of the creme. Brass black was not much better. Back to brass. I will probably send it away to get hot blued.

    IMG_20181209_004239.jpg
     

     

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  17. cafe latte

    cafe latte Active Member

    Messages:
    378
    Location:
    Ravenshoe
    Google it, it is not hard to do hot bluing yourself.
    Chris
     
  18. klipschbro

    klipschbro New Member

    Messages:
    18
    I will never have to use the process for anything else in my life, ever. It will be cheaper to have someone else do it.
     

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