AV spring for the Stihl MS 201T chainsaw. This part fits the side handle to the crankcase by the oil cap. Genuine Stihl part Part number - 11377913101 MS201 TC-M, MS201...
AV spring located inside the top handle at the front of the saw for the Echo 2511 TES top handle chainsaw.
A Genuine Echo product
Part Number V450002050