I agree the seal is definitely over deformed, certainly in one direction. Measurements are shaft OD 35 mm (polished and burr free) yogurt pot OD 36 mm. That pot would have transitioned a rubber seal over the pulley drive / location slot perfectly. However as I have now found out PTFE behaves very differently.Phil the transition sleeve should be the same diameter as the crank sealing diameter - any bigger and you risk stretching the seal or damaging the very delicate lip. If you look at fig 4 in that SKF link I posted earlier you can see the sleeve is just to get the seal to slide over the step in the shaft easily - it doesn't fit over the shaft sealing diameter. I suspect the yogurt pot is too big a diameter and has over stretched the seal.
Seal dimensions, large OD 35 mm, small OD 34.5. So The measurements agree, over stretched. But that could have been caused by the fitting or removal off square.
The first 10 mm of shaft is OD 34 mm with a step up that will catch a seal lip. I suspect the job specific transition sleeve will fit the shaft past this lip making its OD larger than the shaft OD of 35 mm. I will report with measurements.
One thing I am certain of is that you should not mess with this seal unless you have to. I suspect if you work from under the car, and with the sump off, the seal housing will pull off square. Refit it nice and square and I suspect the original seal would slide back into place. Job done.
Unfortunately I made my decisions based on past experiences with rubber seals.