VetPro DC Installation/Service Manual, 00-02-1606, Revision R01
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15. Break loose the spanner ring by turning the spanner wrench counter
clockwise.
16. Repeat steps 14 & 15 to remove the second spanner ring.
17. Carefully remove the tubehead from the yoke.
18. Remember to transfer the friction ring from the original tubehead to the
new tubehead. The friction ring will either be on the shaft of the original
tubehead or in the yoke assembly
Friction Ring