I'm sure you have already measured the bushings in question. There may be a factory bushing from somewhere that may fit it. Even if you found something that was close and could work it a bit. I always try to imagine what I would do if I was in a wagon train moving West and something broke, How would I fix it.
This is very close to what I have. Mine is not an LED but it's also 4 years old. I paid about $230 for it on Amazon. I'm still using the same ink cartridges it came with.
I can speak from experience. When I bought my 226 Ultra, I was driving a big Buick Enclave and with the legs on it, it just barely fit in the back compartment. I'd suggest taking the legs off the saw. If I recall, the bolts are all 7/16" hex.
I use Valvoline synthetic grease. As for how often, it depends on how much you use it. I've done both of mine when I first got them. They were bought used so I did it just so I'd know that they were greased. Both of them are green so they are at least 10 years old. I may do them sometime in 2025 if I live that long.
Welcome back Brenda. I've missed you and wondered what was keeping you away from the Village. I hope you are ok now and all is on the mend. That first scroll job is beautiful. Now, keep them coming.
If you truly need to do it, I think you can just run the install program and it will handle what needs to be done. I keep 2 versions on my PC. I have version 92 as well as the latest version. I have found that the older version works sometimes better than the new one does.
What Kevin wrote is correct. The distance between the upper blade holder and the lower blade holder should be just about what the length of the blades is. If it's wider, that means the tension rod is too short or the tension lever is not returning to the OFF position. Either way, it's an easy fix. The is a lot of info on your saw at scrollsaw.com. Many of the Dewalt inherent problems have been written about there and how to fix them.
Welcome Liz from So. California. I look forward to seeing what you find to make with that saw. It's a great saw if it's of the newer vintage. If you have time, post a couple of pics of it.