What's part called

Flow restrictor disc

http://www.dripworks.com/product/IEZDISC/ez-flo-replacement-parts

Aha Ban thanks kindly

I'm not sure though that a flow restrictor would be available at my minimum size of hole

But I'll Google it and let ya know

Googled that firm, Ban. Evidently they're unaware that any such product as I describe even exists. It's quite a surprise as I just looked over my 19-year collection of defective gages, all having been put out of commission by the quick turnoff

So far no luck but hope to find something here

https://www.google.com/?gws_rd=ssl#q=flow-disc+protects+pressure+gage

But thanks for your interest

If you can't find a flow restrictor disc/washer, the next step up is a hose pressure regulator:
http://www.homedepot.com/p/DIG-25-psi-Hose-Thread-Pressure-Regulator-D46/100180295?MERCH=REC-_-PIPHorizontal1_rr-_-205705675-_-100180295-_-N

Thanks Ban but I'm such a cheapskate...

Okay so I might hafta make 'em. Has anyone got a suggestion for a readily-available solid disc of the appropriate diameter that might accept a pinprick or very small drill and what's it called

Try one of those metal discs we used to call plug nickles.

But thanks, I'll sure look into that'n

Some good old-fashioned hardware stores have a display of trays of miscellaneous parts, one of which should be rubber washers for repairing faucets. I'd look for one of these first. You're probably looking for one with an inside diameter of about 1/4" or your hose really won't have a flow... more like a dribble. Flat, 5/8" or 3/4" outside diameter. If you can't find one of those and want to make it yourself, you might want to consider cutting one from the top of a laundry detergent lid.

Ban that's a splendid suggestion. It's been eons since I've visited, eg, Home Depot or Lowes

Actually it has to be much smaller to protect against the instant surge caused eg, by a timer shutoff. In fact I made one last night from a plastic disk, drilling a hole of 0.021 using a #75 drillbit, the smallest my bench press would accept

The hole size proved about right, but the experiment was a failure because the disc was too thin, transmitting the impulse by distention; so looking round for a thicker plastic disc of appropriate size. Like to use metal but drilling would take forever

Thanks Ban for the suggestion incidentally tho I feel a cap of that sort might also prove too thin

One of these days, I keep telling myself, I've gotta learn to place an image as you've done above

Ban I found a 0.12 plastic disc just the right dia (1 in.) and drilled the 0.012 hole. It seems to work okay but its thickness requires I remove the usu washer

another material that might work and should be easy to find for free is a piece of circuit board material. It should be waterproof, durable and easily drilled.

Thanks again Ban but I hope to find a 1-in. disc requiring no further work except drilling