Strange as it may seem in this day and age, I've never had a bike with aero levers. I skipped them altogether and went straight from non-aero Suntour on my old Trek 760 to Ultegra brifters on my Madone. Now I'm building a bike from parts and decided to go the aero route. (The "new" bike is a mid-80s Trek 770 - I sense a pattern developing - I might have to buy a few more bikes to see if it holds up .)
I bought some used Shimano BL-R400 levers and have a Jagwire Racer cable kit. Feeding the cable in from the front of the lever is no problem. What I can't figure out is how far into the lever's body the cable housing is supposed to extend. It seems to me that if I stuff it in as far as it will go I'll just kink the housing. Is it supposed to seat against the lever body? I can't see how the cable will function without both ends secure, but it doesn't seem like the housing should be bent to seat all the way into the body.