No, you don't need to re-paste the block.
No, you don't need to re-paste the block.
According to the guide, you can secure the thumbscrew using a Phillips tool and it should hold well until it stops moving. Be careful not to apply too much force to avoid damaging the screw.
Found an issue and need a 4-pin connector for the CPU. You have another CPU cable that might be split in half, or should I help you decide?
You have the option to divide the cable. Occasionally you might avoid splitting it entirely and just let the remaining four pins stick out beyond the connector.