Quick update - I purchased a few brass wheels for the cordless drill today and so far, it seems to be going well on the cleanup.
Going back to my initial posting, should I use oil, grease or polish to keep them lubricated, running smoothly and free from rust, or just leave as-is?
As a side note (I know not entirely on topic in this sub-forum) but I have successfully run all motors for 2 hours continuous (no load though) after not being run for at least 6 years and thus also shows the original drivers are OK too. Did it by connecting the cheap Chinese Mach3 compatible board to them... All looking good so far.
If the rain mostly holds off for the next few days then I'm hoping to have it ready for first run / cut early next week.