On the Imagur question, did you click on the BB code (says something about forums) since there are several different hyperlink options? I had to paste your links into Chrome because they didn't work in IE11, but these days more and more websites no longer play well with IE11...
That option doesn’t appear to available to me in the app or safari on my phone. I tried the img tags and it doesn’t appear for me so I assume for everyone else. I tried to add .jpg and tags with no luck.
Interesting about those lines on the Resicast wheels - I assume they are artefacts of how the rubber mould is split to extract the wheels. Any misalignment of edges will show as scars on the casting.
Not sure if it is the mold is getting old or pulled to soon. Should be easy to sand away or cover up but again on the interior side most won’t notice.