Cannot find Part for DB 30

#1
All,
I am having a hard time finding a part that broke on my sons db30.

I think the part is spring and lever but i cannot find the part it is a small sping that is connectec to the bottom of the lever when you accelerate.

Also my older son's db30 had the choke swivel snap off is this replaceable or just replace the carburetor

tx
 
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