Disassembly of DRE The tools for disassembly Attach the stopper to DRE. Screw the stopper until touching the spacer lightly. Attach the Disk remove tool to the stopper. Remove the GC disk by screwing the Disk remove tool. After removing GC disk, remove the spacer by screwing the stopper till the last. Remove the stopper from Pt ring assembly. DRE disassembly is now complete.