Much of the info you want has to do with men 'restoring' what was removed without their permission. You're only wanting to gain a teeny bit more room so should be faster and easier.

Google on Foreskin Restoration, tugging, or stretching. You might not need to buy anything at all, just do some regular tugging to get that skin going. You'll find a lot of advice and much of it is free!

This website has a lot of interesting info: foreskinrestoration.info. Also, check out the organizations NORM - The National Organization of Restoring Men or Foreskin - Are You Missing Something?. Should be able to email them about your questions too.

If you got any more questions, feel free to private message me. I'll send along some websites, etc that might be useful.