One guy here will tell you it’s worth £50 because they want to lowball you, another will tell you it’s worth £5k because they also own one and want to keep the prices high.
Numerous people will PM you with offers because they want to buy from you at a low price before anyone else gets a chance...
They won’t crack if they are not used for the initial loading of the bearings.
- use a different stem cap to load the bearings
- tighten the steerer clamp on the stem
- remove wrong stem cap and fit repro version