Mechanical fuel pump spring?

[colorado_joe]

Looking for assistance.
I'm putting my mechanical fuel pump back on the engine and I'm wondering if I'm missing a spring.
Reason is I pulled a spare pump from an old engine and it has a little yellow spring between the body and the lever arm. My pump does not have this spring. Or did I drop/lose the spring somewhere?
The lever arms are different style too so are there different styles anyway?
See photo and let me know if I'm missing a spring or if I'm okay.
I do notice there is a spring in the back of the housing I can see when I shine a flashlight down in the pump.
Thanks!

 

[colorado_joe]

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[icanfixall]

The old style is on the right and the new style is on the left. No problem. Just make sure the arm is under the cam lobe or the pump will be ruined. Sometimes tha arms actually brok off and ended up in the oil pans. One member found three broken arms in his oil pan when he rebuilt his engine.

 

[colorado_joe]

Great to hear. Thanks for the help.