When i originally built my 210 i put together the turnbuckles and cups like 99% of the RC world does, but had nothing but problems. Went to AE studs and rpm cups with Lunsford turnbuckles. Problem solved but expensive.
When i built my dest210, i learned my lesson. I read the how to, and used a cordless drill. I attached the turnbuckle to the drill and ran it in and out of the cup a few times. Did that on the whole set. Happy to say i have not popped one cup off the truck, or had to use anything besides a turnbuckle wrench to make adjustments.
Just dont run the drill too fast. A few of the cups started to melt if i went too fast.