[Alberg30] main halyard sheave

[Peter Amos]

Does anyone have a good closeup photograph of the main halyard sheave in situ from either directly in front or behind ( or should that be forrard and aft?).  I want to see the gap between the top of the sheave and it's aperture in the mast to judge if a rope halyard will go through or if the gap can be enlarged a little by filing or grinding with a Dremmel.
Peter Amos
p.a.amos at tesco.net
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