A904 Hard 1-2 Shift and Reverse

This is without the return spring. So it is to loose and I need to get the right side (back) of the slotted arm just to the pin?

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Try unscrewing it to close the gap. When the throttle is wide open, the linkage should be at it's furthest position. You would need to jack the car up with stands underneath and have a helper to test it that way.