How about inserting the tube into a sealed container that you can pressurize by a few psi (enough to force the tube to extrude the paste) A lever...
Porosity was our biggest problem. I was involved in large sand castings of aluminum rings. The application was for a high pressure environment and...
Why not use flush mounted neodymium magnets and a plate, if you require a holding force of around 40 lbs. there are many variations of this to...
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