jimattsson
Senior Member
  

Gammal kärlek rostar aldrig
Beiträge: 1090
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Hello Jim, thanks a lot for the drawings. It seems that the seal has been modified over time. As far as I can imagine though, the only really important things about this seal is 1) the flat surfaces in either end that act as valves 2) the overall thickness of 4 mm which defines the travel 3) that there is a grip for the spring in one end. Based upon these three parameters, I suggest a simplified design as in the attached drawing. In my opinion, it should function just as well as the original seal but is a lot easier to manufacture, e. g. by milling 1,5 mm deep circular grooves in a 4 mm rubber sheet and then punching out the seal. What would you say about this? In Sweden, there is no problem finding inch dimensions of bolts etc. In fact, in the 1960s and even '70s, much machinery was still based on the inch system. Volvo cars into the '80s had engines with inch dimensions etc. To this day, inch dimensions are used in carpentry (disguised by using metric names on them - a two-by-four always was 45 x 95 though).
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