When I got G1 Wheelie back in 1986... I'd already owned and been playing with this toy for a few months before I noticed that he had hands!
I got Powermaster Optimus Prime in 1991, but it wasn't until I got the Transformers Generations Deluxe book in 2001 and read about how the head was meant to transform into a roller buggy/robot that would be stored inside the trailer that I decided to see if PM Prime's head could fit inside the trailer and voilą - fits like a glove! Now that's where I keep the head when PM Prime's in vehicle mode (which is most of the time) -- sure beats setting it aside/dumping it in storage!
I may have never worked that out if not for that book (man I miss it
)