I ordered a Shimano MF-TZ31 cassette and the Park tool FR-1.3 on Amazon last week to increase the rear set of gears to 14-34T for mountain climbing. I had the Yukon on the stand today and removed the rear wheel. That was when the problems started. I quickly realized that the motor connector was quite large and, as it turns out, the 18mm lock nut is even larger in diameter. It is impossible to remove the nut and washers from the power wire. I drilled out the Park tool enough to pass the connector but realized that the lock nut was not going to make it unless I drilled the tool paper thin. I went ahead and finished my other tasks at hand and later thought about cutting a slot in the tool to allow it to slip over the cable. This might weaken the tool to a point that it will not loosen the cassette when torqued. I was just curious if anybody had learned a trick to change out the cassette. Any help would be appreciated.