How to Install a High Press Spring in a Small Block Oil Pump

Hey all. I know this is an old post but will always be relevant. Why can't I just use the 11 mm socket on the back of the cup trick and tap it in further into the housing and then install a washer between the cup and the spilt pin?
Cheers
Tony
That may work, but you don't know how much it will increase the pressure. The thicker the stack of washers, the higher the pressure... How will you know when you have enough pressure and not too much???

The spring is a known...