Surface rotational velocity and surface gravity (colour-coded) as a function of the effective temperature of the stripped component of our fiducial binary model. The coloured part of the curve indicates the contraction phase from RLO decoupling towards the sdOB phase. The dashed black lines show the evolution before and after that phase, with arrows indicating the direction of evolution. The time elapsed after the RLO is indicated in Ma by the numbers on the curve. The two observational data points (black and grey) are from Shenar et al. (2020) and Lennon et al. (2021, the errors are smaller than symbol size). The measured rotational velocity includes a factor of sini. The red lines indicate the rotational evolution if the specific angular momentum of the stellar surface was conserved. The star symbols indicate the evolutionary stages, as in Fig. 1.