there's free White manuals via the Singer website
, strange as it may seem.
Look under Singer's "Support and Resources" then select "Instruction manuals" , or follow this link
On the Instructions Manual page you'll see it says "Find Your Manual - Step 1, Step 2 etc etc" and under that there's a search box that says "Model Number"
Into this search box just type "w"
(don't type "white", because that doesn't work)
You'll be taken to a near incomprehensible results page but scroll down and you'll see one listed as "W1505, W1510
" Just click the button "Free download" to the right of the lists, and it will open a PDF file of the manual.
Good luck, and I hope you find what you need :)