Last year I got a set of 7409 replacement "one touch" blades for my '92 Performer, and bought one of Brian's (zavod44) sweet aluminum replacement support bars. Just recently got around to putting it back together. My ashcan and bottom vents are functional again!
The 7409 kit comes with a washer intended to go underneath, but the support bar consumes that "available space" (the nut won't go on if the washer's used because the threads aren't "long" enough.)
Anyway, when I move the lever it's not as smooth as it should be and can squeal loudly, like fingernails on a chalkboard. Any tips are appreciated.