6 thoughts on “SP-15 retaining screws

  1. Karen Dufour - December 4, 2009

    The tap and t-head worked like a charm. I found both locally at a hardware store. Thanks again!

  2. Paul Moxon, Moderator - December 3, 2009

    Correction: the diameter is 1/4″ but the thread pitch is still 28.

    McMaster-Carr has hand taps here: http://www.mcmaster.com/#hand-taps/=4ruio9

    A local machine shop could clean it for you. Be sure to tell them that the rubber should not rest on a flat surface.

    Another idea is to use a round wire brush. The bristles should be a brass or nylon, because steel may damage the interior threads. A Dremmel attachment might work. But proceed with caution.

  3. Karen Dufour - December 3, 2009

    I found one that is 5/16 with a 24 pitch at an automotive store (A-Line). Do you think this is a special-order size, or can you suggest what stores might carry this size? I’ll keep looking online.

  4. Paul Moxon, Moderator - December 3, 2009

    It’s best to bring in the screw to be sure, but I just measured one: 3/16″ diameter with a thread pitch of 28 (meaning 28 threads per inch).

  5. Karen Dufour - December 3, 2009

    Is there a certain size I should look for in an automotive or hardware store, or bring the screw in for someone to assist me with this?

  6. Paul Moxon, Moderator - December 3, 2009

    Likely there is roller material in the threads. You may need to use a tap to clean out the threads.

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