Searching around the web everything reasonably priced stops at 1 1/2. Look at the bright side, a 1.5" cylinder has 2.25 times the cross section of a 1", that should be a hefty jump over what you have.The wood threader that I have now is a 1" - I want a heftier size of the 1-3/4" for other projects.

Taytools Wood Tap and Die for Male/Female ID/OD Threads Polypropylene Threadbox Hardened (1-1/4 Inch x 6 TPI) - - Amazon.com
Taytools Wood Tap and Die for Male/Female ID/OD Threads Polypropylene Threadbox Hardened (1-1/4 Inch x 6 TPI) - - Amazon.com
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