I am using old sprues to make some things. In the process i have to create nipples on the end of the sprue to connect it to a part.  This takes alot of time to manually cut each one and none are exactly the same.

Someone needs to create a nipple creator tool.  Maybe like a pencil sharpener which will make a consistant nipple.  Maybe a special drill bit accessory.

By nipple i am referring to the little nipple on plastic model parts that inserts into a hole for glueing.