I think that’s what I had, or similar. Pics here show how it came apart after possibly its first use. It became very difficult to extend, then the shafts came apart. I then took it to bits to have a look. As per pics.
I think part of the issue was that there’s a gap between the body & the handle where grit gets into (it was mounted on downtube bottlecage) & then when I used it it just scored the shaft & created lots of friction making it very difficult to extend.
Or maybe the air intake got blocked up.
I’m not sure if the pics show the bit you were after.