Originally Posted by
16v_paddy
Going too far to the left is prevented by the bit that sticks up from part number 2, that's what you're hitting causing the knock and why you have to lift up the collar on the gearstick to get reverse
Does the gearstick return to the middle when you let go of it in neutral? That's what the spring FATBOY mentioned does - no.22 in your pic
In your 2nd pic, the big brown bit with the green smudge on it. When you move the gearstick left & right, all that does is make that part move up and down and with the bit I mentioned previously you can't move it too far to the left so wont hurt anything