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I strive to be different, a contrarian, and always from the cheap seats. For example, I want ceramic with my moly... I do cold oil changes (~gasp~)... I wash my engine with Simple Green ... drive in the snow (with snow tires) ... drive on dirt/sand roads in NJ swamps pursuing a rare bird... heck, I even drive around with hot coffee and loose fitting lids... yea, I am that nuts.
Now here is a shocker: I don't use 19mm sockets on my bolts... nosireee.... I use 3/4"... fits a tad more snuggley. Yea, I am out there. Why? I suspect this will lessen the deformation on the bolt head when I use my impact gun for removal.
Maybe its the quality of your 19mm socket. 19mm = 0.748in. It should fit more snuggly than a 3/4" socket...
Make sure whatever socket you're using is a 6 point
they are actually sooo close to each other: 3/4 x 25.4 = 19.05 mm. I’m not surprised Bruce found a better fit with his 3/4” socket though, quick check with my numerous 19mm metric sockets of varying qualities ranged from perfect fit to loosish. My only 3/4” socket was a pretty snug fit but not as good as my best quality metric socket.
Being a metric country where I am, I’m usually struggling to find a metric equivalent to fit the odd SAE fastener that I might not have a SAE tool to fit