39-021 roller diameter

A handy person from New Jersty says:
The roller piece on my operator is 1/2" diameter. Does this match the diameter of the roller on the 39-021? If it does not, I will need to also order the matching slice piece.
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Paul from SWISCO responded:
Thanks for posting. Yes, the diameter of the wheel guide on the end of the 39-021's arm is 1/2".
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