From what I have researched Easton does not make a insert for 1616.
Have to use a glue in nib point.
I have made inserts to fit 1616's from a 1716 insert.
Here is a quote from another source.
Take a 1716, screw a long point onto the end. (A blunt is perfect, 1 long 125 grain field point will work too).
Chuck the field point into a cordless drill. While spinning the insert, take a wide mill fill and remove enough aluminum until the insert will fit into the 1616 shaft.
(You only have to take .016 of the material away).
Nothing to it.