Regarding cycling the hyperspace tube for post up and extra balls, if you do not 
want to have to deal with the gravity well and dropping a ball down the side shoot 
to get a replay, wait for the post to drop down before getting it again. The third 
Hyperspace on a single ball triggers the Post-up. Once at this stage, if you wait 
for the post to drop before getting another Hyperspace. Each Hyperspace you get 
takes you back to Post-Up, as often as you can do it. 
Note: A much more controllable Hyperspace shot is from the tip of the left flipper.