This spring-loaded test pogo pin would be a good poker.

Normally used for testing circuit boards or programming via electronic JTAG interfaces, they also make killer-looking feet!

This model has 3 flats chiselled together to a single point 1.5mm (0.59") in diameter. The outer shaft diameter is 1.01mm (0.040"), overall uncompressed length of 33mm (1.3") with 6.5mm (1/4") travel.