The Seat Chuck: A mandrel to hold valve seats. Advantages of the seat chuck include fast and easy installation on any lathe or crank grinder, simple expansion of the chucks by center, allows for fast mounting and dismounting of the seat to be machined, reduces the need for an extensive seat inventory, allows you to reuse old and obsolete stock, lets you make seat sizes that are uncommon or hard to get. When making seats from bar stock even the smallest leftovers can be used. See the video demonstration: https://www.youtube.com/watch?v=fAXH8I6SFKM
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