On the way of buiding my CR01, I met a problem never happened to Tamiya parts
If you had a manual pls refer to page 14, step 24, fitting BD7 the 2415 bearing to sun gear
the problem is the inner dia. didnot fit, and it ended up with the sungear protruded its gear box so you can not close it with motor plate...
I then measured the dia. of the neck that accepts bearing =15~15.1mm, 2415 bearing has a 15mm inner dia.... there is no way they could fit eachother...I coundn't believe my eyes as it never exist in my building experience (of Tamiya kits)
I had to sand it off little by little to make it right...So it is me only, or, you had the same problem?