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 robot feet! Use them with the PPH1 pogo pin holder for quick and easy replacement.

This model has 3 flats chiseled together to a single point 1.5mm (0.059″) in diameter. The outer shaft diameter is 1.01mm (0.040″), overall uncompressed length of 33mm (1.3″) with 6.5mm (1/4″) travel.