installed new upper ball joints today. due to the lack of a real thread, the new ball jointsz just dont fit that great. has anyone run across this problem? would it be ok to just tack weeld them in 2-3 places just to ensure they stay put? we dont figure a whole lot of force will be put on this one spot, and that they hoipefully wont hafta be changed anytime soon. any advice? btw its the stock upper control arms and moog ball joints....