Hi PurpleRose. Glad it worked. But what was it in particular that worked for you?
The dowl. The shortest extender rod that came with my generic extender is 1” but I needed less for a bit more stretch and couldn’t fathom how to do it. You were 100% correct, I found a dowl joint that came with some flatpack furniture and cut it in two. The two halves fit the plastic support piece perfectly giving me that extra 10-12mm I needed.