This Japanese stickgrenade worked exactly the same as the german stick from WW2. It had a safetycap on the base of the stick which had to be unscrewed to reveal the pull string. When pulled, it ignited the delay of about 4 seconds. The grenade body was made of thick steel and was fixed to the wooden stick by screws. Shown below on the left are 2 slightly different types.
Scans right and below thanks to Dr. Ruby.
Photos © John.