to decide whether to replace the input bearing, a non-scientific way of checking the amount of bearing play was to slot each input shaft into the bellhousing, anchor the measure tape and read the amount of give from wiggling the end side to side.
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the current shaft with the worn 5th gear has 1.5mm of play while the prev old shaft (which I believe also whined) has 2mm of give.
I think the best option is to replace the bearing to be safe.
the NSK 6305 ball bearing is like £8 and getting a local shop to source n fit the bearing is prob a doddle.
buying a £10 gear puller and hammering the new bearing on myself just ain't worth the risk of damage.
measuring the other end of the shaft to see how much its worn, the current shaft with worn 5th is 28mm dia while the prev old shaft is 28.01mm dia so is newer.
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