I'm starting another rebuild soon so any hints on improving or smoothing gear selection would be appreciated.
One thing I've mentioned on the forum previously is the roll pin on the selector fork shaft. The shaft which has the gearshift lever on one end and the selector fork on the other is prone to wear. This occurs in the tiny roll pin which holds the selector fork assembly to the shaft. In minor cases you can detect a little rotation movement in the selector fork assembly (in relation to the shaft) and in major cases the roll pin shears completely. My assumption is that the roll pin acts as a break point when some heavy footed person stomps on the gearchange. Better to shear a roll pin than the shaft and the whole thing is fixable without splitting the cases.
Anyhow, if there is some wear, go up a size in the roll pin because any movement at all makes gear selection difficult.