I am looking for some insight into routing a channel 8mm wide X 3mm on some window frames to accept weather stripping (carrier & brush). It would seem that I have 2 options for creating the channel:
(1) Route along the edge of the window using a straight bit.
(2) Route along the face of the window using a slot bit (i.e. cuts 90- degrees off from the plane of the bit axis)
What do folks usually do? My inclination is to take option 2, but I am having problems finding a 8mm slot bit. Am I just not looking in the right places (screwfix, axminster, etc.)? Or am I thinking about this the wrong way?
Thanks in advance