Gecko rectangular plunger

redesign of plunger and plunger rod in a style more akin to Sillybutts designs (rectangular instead of round); therefore much stronger and easier to print.

Modified catch assembly to accept rectangular plunger rod.

Plunger tube changed to 30mm OD and 26mm ID (OG 27mm ID) as it was easier to source.

Requires ~24mm x 3mm o-ring (OD x diameter). ~25x3mm was a tad to tight for me but functional. YMMV, step is included so you can adjust to your liking.

Spring OD<6.5mm and L>10mm (installed length 9mm, compressed 5.5mm)

2x M3x8 or some glue for the rod aligner