The oil machining leaves the base notched up to right under the head bolt washer. Oil can then spray either direction- front or rear- because there is a triangular trench left under the head of the washer, Barton lays a piece of o ring material in this trench and fastens the head bolt on top of it. Doesn't usually completely seal but brings oil flow escaping down to a dribble.....

HERE IS MY QUESTION!!!!!
Can I buy a larger diameter piece of Viton cord, Use a razor or exacto knife and produce a triangular piece of viton that almost completely fills the void, then clamp the washer down on top and seal far better than an o ring would???