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Well I got a quote from Graydon Casting for £79 Inc VAT. I decided too keep it simple and forego the internal core and machine out the internals instead. Took 1 month from paying invoice to receiving casting as per below

Any ideas what this would be used for? it counts revolutions, one revolution of the shaft is one division on the scale.

Hi I am from Weymouth U.K. I have built several 4 stroke petrol engines from commercial castings, Wallaby,Mastiff & sea lion which run successfully. I’ve now designed my own 30cc inline 4 cylinder OHV engine. I have taught myself basic Freecad (very frustrating) and 3D printed the plugs for...