Shim for increased Oil Pressure

[jimeneztrans84]

(08-10-2016 )Hammerhead Wrote:  This is the deburring tool I keep referring to. Place the end inside a tube, pipe, or hole and put the curve at the angle to the sharp edge and apply circular pressure to make a nice smooth radiused edge.

So with that tool you're basically using it to smoothen out the material so when the dog bone slide out it won't cut the o ring? If I don't use it I'll damage the o ring? What else can I use?