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... i have a model 30 jiffy 10" that doesn't do this.
... both the 8" and 10" heads for my Jiffy 30 often bind. I thought it was due to a combination of the single-blade design plus cutting aggressiveness ... the entire width of the single 'flat' (non-curved) blade breaking through the ice all at once, "biting-off more that it can chew" so-to-speak.