what 's meaning of this paragraph?

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Regarding heat treat, on print: Harden and temper RC35-40.  See below, the right way to do it:
Jack - The factory is correct to be concerned with the deformation of the flanges in heat treating - 4130 requires a rapid water quench after heat treating. The tempering operation though will increase the ductility & allow them to  Hopefully they are planning on machining tabs after HT & temper - These are the critical working surfaces.

Ed is correct too - Unheatreated 4130 is useless to Napco. Parts will not function except as prototypes - Will wear out too quickly. On ly 100 Rb!

Possible short turn solutions - How about using a steel that does not require HT for initial run - Both 4330 & 4340 are readily available, have similar shrink factors as 4130 (so the die would still be good) & a hardness (annealed) of Rc 20 - Lower than the spec required, but maybe engineering would OK - 17-4PH would also work - Has Rc 36 annealed condition & would not require plating. More expensive than 4130 but until we got our HT process inline it would give Napco usable product.

Just a couple suggestions