Not Fast, just "Less Slow"

Not much time today so...I'm still working on the car so this won't take long.

I made a piston stop by breaking/cutting the guts out of an old spark plug from my Neon.
Ran a 5/16" diameter drill through the steel body.
Tapped it for 3/8"-16 UNC.
Tacked a wing nut onto a hunk of 3/8"-16 threaded rod.
Screwed the body into the spark plug hole in the head.
Turned the crank a little past TDC.
Threaded the rod into the body until it contacted the piston.
Stuck a piece of masking tape onto the outer circumference of the damper and made a mark where the factory punch was on the tape.
Rotated the crank around until the piston contacted the "tool" and made another mark.
Measured the distance between the 2 marks on the tape and divided by 2.
Checked the distances from each mark on the tape to the indicated TDC on the damper.
Mine was off by about 1/32" so I just re-punched the TDC mark with a chisel.

The pointer is held on with a single screw but it is located with a dowel pin. I know Chrysler engineers were very anal and I was expecting it to be close.
Maybe a little extreme for "only" a slant six but it was easy (and free) and at least I know where true TDC is.