User blog comment:Swift Blade Pro/Subnautica Roleplay/@comment-34216095-20180110174316/@comment-29231733-20180110195629

"I've actually tried to combine a grapple, a propultion cannon and a torpedo launcher on a single arm. You can change between all of these three modes thank to a disc that rotate on command to change mode."

Will finish removing and give you the arm:

"Wait me here while I go get the new arm.