Welcome, Jen.
I think gears are available for the 648 at
https://store.tandtrepair.com/gears.html At least that is the site that many have referred to, especially for slant shanks. There may be a delay, due to the fact that they are not located in mainland USA and because of the pandemic.
I think you might have a typo as you have a 1904 #27, with puzzle box. Nice. The 127's did not show up until about 8-9 years later.
A lot of the attachments for the 27 will fit on the 101.
We like pictures. You will probably need to reduce or compress the picture to a
file size that is smaller than 2MB How to post images can be found at
https://www.quiltingboard.com/attach...020-01-17-.pdf
Don't forget to
scroll over to the far right to find and click on the
"Upload" button,
Janey - Neat people never make the exciting discoveries I do.
Not affiliated with off-site link(s)