I guess no serviceable parts unside. I noticed the same thing and I don't like it at all. So, I bought OEM brand new handles from partsouq.com each $65ish. They also have chrome OEM handles for the same price. Mine is white so chrome is not ideal.
The rubber inside the pull leaver is worn out. Perhaps if you play with it, you might find a matching item to replace work rubber. I initially though soft butyl rubber off of a mouth/tooth guard and some hot glue might fix that sloppyness.