Heidelberg Gripper Carrier Loose

Hi. I recently found that I can wiggle my gripper head assembly (gripper carrier?) slightly about a 1/32 or 1/16 of an inch.

Can someone provide some instruction as to how I might resolve this issue? Do I tighten T1421? What’s the best tool to use? It’s a tight squeeze between the hex screw and spring.

Many thanks!

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