Spearhead and medieval throwing weapons

Spearhead is forged from springsteel and it's about 32 cm long. I just tested the idea if you can use that cross section part also for locking the head to the shaft (You have to make similar hole also through the wooden shaft of cource..)

Things in the bottom picture are 13-15th century european throwing weapons called "Hurlbats". Lengths are about 34-37 cm and the pieces weight 640-730 grams. I made them from 6 mm and 10 mm steel plates, with my new plasma cutter and used also forging methods for that cross shaped one.