Brushcutters

I have a Husqvarna HU625HWT. I had to replace the carrier plate & mow ball assembly as they were damaged during use. String couldn't be clipped on the carrier plate b/c the clips were broken off. The mow ball assembly was cracked. I began reassembly but am confused. The locking plate spring had become rusted & stretched so I bought a new one. When removing the old parts the locking plate wasn't doing anything. The locking plate & retaining ring that I took out during disassembly & the new spring aren't currently attached because I have no idea of the right configuration for them. Not sure what they do. I believe the spring on one side attaches to the locking plate but where else does it attach? What does the locking plate do, just sit on top of the carrier plate, or? The assembly diagrams are not specific regarding connections/placement of the parts. Deeply appreciate any help or links to helpful material that can be offered.