Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
A perfect fit and cost efficient! The most difficult part was putting the gear in the motor and back in place. Once attached to the regulator but not too bad. Took about 45 mins overall to get it replaced!