I'm looking at my HPI E10 right now. If you have the stock HPI E10 plastic "shocks", they aren't really designed to be taken apart (at least easily). Since the 2 pieces of the plastic shock assembly snap together, you probably can use a small flat screw driver to force the "shock piston" piece apart. You can see a picture of a unassembled HPI E10 shock as part of the HPI spare part #85610 and 2 can be purchased on TowerHobbies for about $6 USD (http://www3.towerhobbies.com/cgi-bin...FVSEARCH=85610
There are 2 options for the HPI E10 if you want to upgrade to oil filled shocks. The 1st is HPI E10 threaded shocks (http://www3.towerhobbies.com/cgi-bin...?&I=LXVUV5&P=7
). Another option is to buy an aftermarket shock tower that will allow you to use standard touring car shocks. Here is an example made by Atomic RC - (http://www.rcatomic.com/atomic/index...emart&Itemid=1
As far as mounting hard plastic drive tires onto plastic wheels, heating up the tire makes it easier. Be careful if heating the tire to not burn your hands. Some protective gloves would be a good idea. You can also cool off the wheel as this will also help.
This method can also be used when trying to separate 2 glasses that are stuck together. Place some ice water in the inside glass and then place the outside glass into hot water and the 2 should separate.