OK, I think I found the correct manual.
http://www.acehobby.com/ace/PDF/Airp...asyTrainer.pdf

On page 5 it shows a picture of the parts which includes 2 dowels. I didn't find, in my qick read thru where it says to install them. There is only one picture of one installed on pg 15 and that is poor. I may have missed something though as I was in a hurry.

I hope this is the correct manual. I imagine you will need to cut the covering ( locate holes from inside) to install dowels. You may need to go to the LHS for another dowel if you have lost one or never got it. Easier than waiting for replacement unless local dealer will replace it.