Hey Paul_TC4, The strength of the stock molded side braces on your TC-4 that hold the vertical ball stud is not really comparable to the Quasi-isotropic Carbon fiber thats used on all of the BMI chassis and top decks....Iv'e also cracked a couple of the stock team TC-4 vertical side mounts, as well as having them loosen up many times, especially when you do alot of tuning and switch from running no washers under the ballstud, to using one or two (giving less thread depth into the brace)....most guys I know who still run the stock TC-4 team chassis have hellicoiled this area just like many do on the B4 buggy vertical ball mounts.....with the BMI you run a locknut underneath the ballstud so there's little chance of it comming loose.....and iv'e never seen one break.........Also,on a side note, the quasi-isotropic carbon fiber that BMI uses on all of their kits is the best quality carbon fiber that is available anywhere......Because of the "major" price difference between a sheet of component grade CF, and a sheet of quasi-isotropic carbon fiber, R/C car companies are pretty much forced to use substandard component grade (layed in only two directions during it's creation) CF in their kits .......This is also one of the reasons that many switch to a BMI chassis
