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Castings aren't the same , though to the untrained eye you may thing so. I am not sure if I spell this right but meehanite castings are what you want. Cast iron alloys can range from pure crap to semi crap to good to great.
HF don't have good castings.If you are just joining a 4 inch joiner is perfect for tops and backs. The most important thing is also the knive. HSS can range in many alloys and hardness see if you can get air hard or heat treat to RC58 , tool steel are best if you can find them.
Grizzy has a spring on the heads that make alignment of a new set of knives alot easier. Take a square and check the fence also. Qualtiy will stand out to the trained eye once you seen enough.
Look at the surface , you want to see ginding not circular blanchard marks. Flat surface grinding is often more accurate and less latering to the heat treating.
Good luck.
john
PS be sure the bearings are sealed
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