Truck throwout arm help?

Somehow during my rebuild I lost the return spring for my throwout arm, and if that's not enough fun I have no idea what it looks like or where it hooks to the block.

This is on an 82 D150, slant and 833OD. Does anyone have a photo of this setup? I can see where the spring goes on the arm but the block is unclear. Maybe it hooks to the half-round hole where he block meets the bellhousing? Any help especially spring measurements would be greatly appreciated.

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