Wellnut, #110-32 .75D X .804
          (601R, 601F, 611, 632, 642, 650, 680,
          690, 430)
    430   Prior to serial #1931384. Starting with
          serial # 1931384 see 3220360
    561   Prior to Serial #M1914144/P1919759.
          Starting with #M1914144/P1919759 see
          3220360.
    601F  Prior to Serial #M1897614/P1929859.
          Starting with #M1897614/P1929859 see
          3220360.
    601R  Prior to Serial #M1897614/P1929859.
          Starting with #M1897614/P1929859 see
          3220360.
    611   Prior to Serial #M1897614/P1929859.
          Starting with #M1897614/P1929859 see
          3220360.
    632   Prior to Serial #M1914144/P1919759.
          Starting with #M1914144/P1919759 see
          3220360.
    642   Prior to Serial #M1914144/P1919759.
          Starting with #M1914144/P1919759 see
          3220360.
    650   Prior to Serial #M1897614/P1929859.
          Starting with #M1897614/P1929859 see
          3220360.
    680   Prior to Serial #M1914144/P1919759.
          Starting with #M1914144/P1919759 see
          3220360.
    690   Prior to Serial #M1914144/P1919759.
          Starting with #M1914144/P1919759 see
          3220360.