Tim, I'm with Rob on this one. If funds are really tight, I understand not wanting to spend 2500.00+, but you have to fix the one grate anyway. If you have a round Door, I'd get over to Rite-Aid and get plenty of first aid supplies...big bandages are a must, as is antibacterial ointment. I don't know if you enjoy an adult beverage, but I'm telling you up front this is no walk in the park. If it can rust tight, it has, if it can be seized, it will be, if frustration bothers you...well, suck it up!
I'd liken it to trying to give a Wolverine a Prostate Exam, without any restraints AND wondering why he doesn't want to be your friend!! I've re-grown skin hundreds of times, but you will just have a ball with this one. You will NEVER again ask why numerous folks just love their Keystokers. Don't misunderstand me, EFM is a terrific product, but like a BMW, you better expect some "Extra Care" will be required AND likewise, tuning a Beemer AIN'T like tuning a Chevy.
Having said all that, the grates are only 20 each or less, BUT getting them out will challenge your constitution.
I assume you are familiar with the 'Monkey trying to have intimate relations with a football scenario, well, you are now the Monkey, and I hope you will fill us in on your adventure.'
If you just obtained this unit, then any reputable re-builder would have repaired, anti-seized, and freed up the square head bolts, so perhaps you can laugh at me making a big deal out of it, for your sake, I sure hope I can be the brunt of your humor.
PS: Nerve ending die in 4 days, skin regrows to about 60 % in 1 week, and the rest of the recovery will be within 90 days! (if things don't go as well as you might have liked)