I thought when I was taking apart my redcat engine it had a small ring. After taking the piston out i think you're right. I wouldn't have thought that they would make a detent. It seems useless
Thanks i might've misremebered since its been a feq months. If you want to see this engine run by the way ill be posting a video whenever i get around to ordering a bump box ( i have two of these and one them is fully rebuilt )