1971 Johnson 40HP outboards Service Manual, Page 27Get this manual
dTwist the hook around to grasp the "0" ringthen pull out cPush the plunger down with the straight instrumentdPinch the "0" ring together and gently push into position with fingers
To install the "0" ring in the connector, proceed as follows: aPlace drop or two of oil on the "0" ringbPlac the "0" ring on face of the connector