[RC-Monster Mike]

There should have been two shafts in the package for the spider gears. This is perfectly normal. If you could not find the included modified shafts, a dremel with a grinding wheel will get you up to speed in about 2 minutes. Simply round the edges of the stock spider cross pins before you insert them in the diff. The diff cups include the modofied pins now, so you should have them somewhere(unless they are thrown away already). Any ways, it is quite easy to modify yourself.