Main geartrain assembled and cluster gear mounted... then found that the countershaft was broken on the end where the woodruff key slot is. I may have even broken it driving it in, not sure. So I have another one the way from Brewers. BTW, the rebuild kit that Brewers sent me was excellent, especially the $9 needle bearing mounting tube. It was precisely sized for length (including thrust washers) and diameter inside the cluster gear. I used chilled, Brewers assembly lube to install the bearings and slapped the thrust washers on the end of the cg. The whole thing dropped perfectly into the grooves inside the case and the helper tube pounded out smoothly with the installation of the countershaft.
Removing the seal inside the bearing retainer was a bit of a challenge. But came out with careful tapping of a small, sharpened screwdriver at intervals around the circle.