I was looking in my 2003 Blazer service manual's section on installing an oil filter adaptor and found a couple of unfamiliar terms: "drift" and "stake." When installing a new oil filter bypass valve, it says to use a brass drift the same diameter as the bypass valve, install the valve, and use a pointed punch to stake the engine block area around the oil filter bypass valve in three locations 120 degrees apart. Then install the adaptor.
I take this to mean place some kind of brass thing on the valve and whack it in at three separate but equal points. I suppose it would all be clear if I just jumped into it, but various experiences have shown me that don't always work out.
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Brass Drift == Brass Punch - basically a flat faced striking tool

The punch is used to install the valve and needs to be roughly the same diameter, but slightly smaller to press the valve into the block without damaging the rear face of the valve.

Stake == disrupt material to form an interference fit or increase the interference fit - typically done to a bore to prevent the install appliance from being able to back out. Staking is also the manufacturing method used to hot rivet material together.

You stake the opening to prevent the valve from coming back out the hole it is installed in. This can be done with a pointed punch by positioning the punch on the flat surface just outside the hole being staked and striking the punch with a hammer to deform material into the hole. Repeat as specified (3x 120deg apart).

 

Wow. Thanks. I expected a series of responses, mostly guesses, from several people, and I got a really definite answer. I'm impressed.