Update to the progress for lowering the rear of the G310R. To help do this change a little safer, I created a spring compressor tool from some 25mm plate aluminum I had on hand along with two 300mm sections of 1/2"-13 threaded rod along with the nuts and washers. I bored out the holes to fit each end of the shock with the deeper pocket to capture the spring.
This tool allows me to safely compress the spring enough to remove the retaining washer from the keeper.
After the retaining washer is removed, you will need a 19mm to loosen the jam nut against the bottom clevis. I was mistaken about the thread pitch prior. It is actually M14x1.25mm. The mounting depth for the factory clevis is 17.5mm deep. Within the photo below are, from left to right: The factory clevis, (47.5mm tall to the center of the bushing), my first prototype (32.5mm tall) and the smallest size (27.0mm tall).
This will reduce the shock overall length to 280.5mm. After measuring the swingarm length, fully extended swingarm position, and adjusting for the shock length, it looks like the shortest version will move the rear axle upward in its arc 59mm. If used in combination with raising the front fork tubes in the triple tree to equal the rear might be a great starting point for my daughter. To get additional clearance under the handlerbars, a set of additional spacers could be made to raise the handlebar clamps. With the factory bolt on each side, there is enough thread to make a 5mm spacer without replacing the M10x65mm bolt with a longer unit.
More to come.