Oil pressure switch in VW1302 Super Beetle

So long period of time have I been ignoring the motor oil leakage at the oil pressure switch portion in VW 1302 Super Beetle AD motor. Made up my mind to stop the inconvenient phenomena, most of my friend propose the opinion to replace the part into new one, because the material of adjacent part of it is made of plastic, it has shrunk by long time of thermal cycle over 40 years. Basically agree with the opinion, I tried to repair it by means of fulfilling the space with Alpha-Cyanoacrylate material.
As the original switching function is maintained after the experimental trial, I would like to continue this old part in position for the time being.
I have an intention that the original part should be maintained and continued so far as the designed physical property is in alive condition.

On the other hand, the opinion of my son is just like an opposite one, he says that  any long used and having any problem should be replaced immediately into a new part because he would be at a loss if his car should stop on the way with a distance.

As an another story, a washing machine for family use with the name "Gentle Lovely Wife" was deserted without notice by my Xanthippe in spite of the promise with me that I would repair firmly as usual after coming back from work. In addition, she payed some money for bring it out!  The machine could have been repaired and regained the original performance with relatively easy task for me.
She cried, "I don't like to continue this kind of old fashioned and ugly designed!".
I just had not enough energy to explain about her wrong opinion and I said nothing about that. Just old and out of fashion are the reason to desert a precious machinery, how come, said to myself?

As a conclusion today, any machinery has it's history and an enthusiastic intention by the designers and the engineers.