Honda HS1810Z Owner's Manual page 59

For use on uneven surfaces, lower the skid up to the limit to obtain the
maximum scraper ground clearance.
Adjust the skid equally on both sides.
Be sure to tighten the skid and scraper bolts securely after making
adjustment.
Do not use the snowblower on rough or uneven surfaces with the
auger ground clearance set for hard snow or surfaces.
This may cause serious damage to the snow blowing mechanism.
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