The Acmeda S45 RB09 Easy-Lock Extendable Idler is for the CF90 Cassette Rollers / Fascia Suite system. Moreover, the Acmeda RB09-0245 extendable idler is for roller shades with 40mm projection. The idler or idle end plug utilizes a a spring loaded pin for fastening into the mounting bracket.
It is easier to match the right part to the repair, so we recommend that you either email us a photo of the part or bring it in. It is likely that we can provide a substitute part if we can’t match the damaged one exactly, which will do the job just as well.