Depending how bent. A. good engineer will be able to straighten them. I nearly always manage to do mine without pulling apart. Just support under the end of the lower slider & at the top of the tube & revolve it to find the high point & have 'that' directly under the press ram but using something semi soft at each point to avoid damage. Easy to say but takes time to get it right & easy to get it wrong. Always need to go 'past' the point of straight to de-stress it i find. Something like that.

If they aren't bent too bad you can try my method using a band clamp. It worked on my little JT forks.

yamaha-enduros.com/index.php/forums/mini...bent-forks-cheap-fix

Or even try the reverse of Schu's good trick above & turn them exactly towards each other & lay the bike on its side then put a jack between the forks & jack them outwards until straight. On second thoughts maybe not. If i tried that the jack would fly out & hit me in the head knowing my luck lol.