For those of U that have problems with the shocktowers coming loose and/or threads are stipping in the boxes. There is an "commersial" version from BMI racing available (
www.bmiracing.com) but its very easy to make one with 99% AE parts. The RC12L3/L4 chassi standoffs #4442B are 100% the right hight as they come. Just downsize one of its end to about 4.5mm and epoxy glue (JB Quick) an 4-40 socket steel screw together with an AE #4 aluminium washer. Look at the picture. Then take a 5mm drill and open up the hole in the shocktower that originally is just there for reaching the std 4-40 screw. Use 1.25" countersunk steel screws and run them all the way from the bottom through the chassi and lower and upper gearboxes. Use the "AEfix" assembly and tighten it down from the top, use some blue locktite.
go to page 196 or 197 on the ntc3 thread and it will show you the pictures.
got this off this site, this will help you alot helped me, hope this helps in what you are looking for. as far as hinge pins take them out, roll them on the table and you will know if you need new ones or not, but always a good thing to have in your box of parts.