The legendary spray and pray.

Like the “real” grail, it doesn’t exist. A mutual standard and compatibility between aftermarket automotive components. IOW, if I’m building a car, I’d want a third party automatic headlight system to work with the backlighting in the instruments, the wiper controller to work with a stock steering column switch, the air conditioning to work with any temperature sensor and thermostatic control at all…. Yeah. You need to be a programming expert and have the ability to design a controller to get all these proprietary systems to function coherently. But instead it’s cadging together systems and trying to not make it clunky and distracting.

Also, gaming: the grail would be for abandoned games that require online servers to play are turned over to the gamers. Run your own servers and mods. Licensing servers can be contracted out to third parties, so you can still buy the game and a royalty is paid to the original studio, but they don’t have to maintain it anymore.

The Alpha Lotus

Atari Falcon

The America's Cup.

I've started collecting 1:24 and 1:18 scale models of my favorite movie cars and I guess you could say my holy grail would be a 1:18 sized, 1985, Cumberland Grey, V8 Vantage Aston Martin, from 007's The Living Daylights (and recently, No Time To Die). That and the 1:18 Chevy Nova from Death Proof, without breaking my bank account.

As a hobby engineer/machinist I would say any "medium" sized mill but specifically Bridgeport mills are especially coveted by hobbyists.

If I found a reasonably priced Bridgeport even one that needed a bit of work, I would happily sell my Chinese machine and make some extra room in my workshop.

A 1959 Gibson Les Paul in to a Marshall Plexi.

The Babel Fish

The true Holy Grail item in my hobby of motorcycle riding would be a MotoGP bike.

Realistically the achievable halo option is a 1000cc supersport and lots of track days.

My multimeter

A workshop 😅

Astronomy, something like this https://www.telescopesplus.com/products/meade-16-inch-lx200-acf-f-10-advanced-coma-free-telescope

SAKO TRG 22/42 A1 a good home defense tool for light sleepers.

Size 14 socket head

I really want a used arcade machine for drum mania. It's a party of my childhood I miss