Out of interest, I just tried 13E, 19.2E and 23.5E on my TD110, seems to work OK, so it might on the TD88, but my 23.5E and 19.2E LNBs are touching. In the photo below, I have not done any adjustments either, it is just where it ended up when I taped it on.
The middle one is 19.2E, the RHS is 23.5E and the LHS is 13E (not quite right, it needs to come left a bit)