Just picked up a 2nd hand Sonic 100 that needs a couple of repairs. One small area needs to have some urethane foam injected to fix a soft spot and there is another spot just beyond the edge of the rear padz which is soft and has a crack in the laminate - heel pressure (see image with padz removed). I'm OK with the foam injection thanks to advice from Lao Shi. But before I start sanding out the crack I wanted to ask if anyone knew what the laminate schedule was on the Sonics. Can I expect to find PVC foam sandwich or will it just be layers of class/carbon?