I have a single 5/16 tool, I took a 1 1/2"- well several, and sometimes have to make em in the woods- cut a 1 1/2" piece of 5/16,cut a slit end to end, slip it over the end of your 3/16 and clamp it in the tool- works great for anyone who needs to work 3/16 with a 5/16 tool that is.
'12 15 jugs - Steam pans
'17 125 3/16 - 18" x 72" drop flue on homemade arch
'18 240 3/16 - Deer Run 125
'19 450 3/16 - Converted RO to electric/added a membrane
'20 600 3/16 - Maple Pro 2x6 Raised Flue, added AOF/AUF
'21 570 3/16 - Built steam hood, Smoky Lake filter press
'22 800 3/16 - Upgraded RO to 4 4x40
'23 500 3/16 - Re-plumbed RO, new "Guzzler"
'24 500 3/16 - Steam Away, DIY 8x40 RO