Greeting technically-minded Fiat enthusiasts. An 850 Spider out here in California will soon run on a 9/35 (3.89:1) crown (ring) and pinion gear set -- thanks to Middle Barton Garage, in Bicester. Unfortunately, the new pinion is not equipped with the little speedometer gear that fits into the threaded end of the pinion shaft...which leads us to the question: How does one remove this little gear without damaging anything? Is this possible? Would love to hear from someone who's successfully performed this operation