What size needles can I use for my Singer 39a3?

I have no manual. What number needles does this machine use and up to what size can it take? I am hoping to sew some medium-weight leather
Dennis J DeRosa, August 2019


done
A very quick G##gle search threw up this:

https://www.justanswer.com/general/793oe-merritt-39a3-breaks-needles-when-back-stitch-feed.html

which then led here:

http://parts.singerco.com/IPsvcManuals/391A1_3.pdf

Did that help? Please post back and let us know, August 2019
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