I’ve got a 5 yr old C2700 preamp with the factory tubes still in it and am upgrading to Rays tubes. I have removed the case top and metal securing strip so they are fully accessible to remove, but when I pull on them they won’t slide out. I’m using a cloth glove and unplugged the unit but is there any trick or tool I need to buy to pull these things out? I feel like I’m on the verge of breaking them, then I’m screwed, and maybe cut. I even tried wiggling them a little to try and break the bond but no such luck. Any tips welcome and appreciated.