I created an extrution, but I don't want it to end straight. Instead I want the extrusion end filleted. I tried many different filet options, but to no avail yet.

Can someone please give me a hint and tell me how to create the desired filet?

Attached please find the file in question.

This is the current situation:

This is the extrusion:	This is a close-up of the extrusion in question:	This is a sketch of the desired situation:

Your help is very much appreciated.