The 107 o-rings are “smaller” but still work, they just do not apply as much pressure to the pins as the original.
The cup that holds the ring, just imagine the original ring is four ounces in that cup, the #107 fills like 3 ounces and still works.
Frank used them for one reason….cost
They fit, they perform by sealing things up.
Cost of an original OMC ring: Currently $3.10
Cost of a bag of 100 pieces of the #107 o-ring from McMaster-Carr: $3
That is why I include them with the tool.
Richard
http://www.richardsoutboardtools.com
classicomctools@gmail.com
