A couple of months ago, I spied one of my most wanted decal sets at a thrift store and gasped when it was even in my price range (for a reason - missing slide plate, electrical wires cut, missing stitch length lever, no pedal...

) but it IS an RAF decal.
I even saw the cracked japanning on the machine but I didn't care.
Today, I care a little more and wonder if there's anything I can do to minimize it? I've been doing a lot of cleaning of the finish per Glenn's tutorial and it's cleaning up beautifully.
Before:
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Currently:
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And a closer look at the cracked finish (prior to the 2 hours of cleaning on the finish I just did):
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The linseed oil and alcohol phase of Glenn's process seems to have made it a tiny bit flatter but if there's something else I can do for it, I'd like to. Does anyone else have any experience with this? I know that some of the Pfaff 130s do this too (mine included)