Need extractor plunger bore diameter and depth or blueprints. Sterling/Wiselite

[Rogue.Pirate7.62]

Hey guys, I've searched up and down for blueprints, believe I found some with the diameter of the bore that the extractor plunger and spring rests in, but not the depth. Looking this info to relay to my gunsmith as I wasn't able to track down another converted Wiselite style bolt.

Purchased a Sterling semi auto conversion by Wiselite years ago and have never shot it as the extractor plunger was seized in place. I got the replacement spring and plunger from Apex but the old plunger has to be milled out. If you know someone with a built or stripped semi auto bolt that Wiselite converted, I may would go that route as well.

Thanks in advance! Alex.