Just out of curiosity whats your thoughts on making it permanent instead of keeping it removable. Is it because of the loose fit on the quick connect mount? My 420 loader had a pretty loose fit and I was able to tighten it up by putting shims between the mount and loader arms.
If you really wanted to make it permanent you could probably weld the arms to the mounting arms but I wouldn't recommend because you would have to most likely cut the welds if you ever wanted to remove the loader.