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The 405 should have 20 DP gears, IIRC. But, you should measure the OD and tooth count of your gears to be sure.
Kit, I've got the 3D printer files from Thingiverse contributor dsell. The info on the gears he designed are as follows: 14.5 PA; 18 DP; 3/8" thick; 1/8" key; 9/16" hole. If you can find the same info on the gears your lathe takes, this will help you figure out if they can work for you. I've still not been able to figure out if they'll work on my Heavy 10L, but it's so far from being usable that's not a priority for me yet. I do have a 3D printer, and hope to be able to get to it one of these days. So far, I've printed one 127 tooth mini-lathe change gear, and several years after having printed it, I still can't tell you if it will actually work on the 7x10 mini-lathe. I purchased the 3d printer to make change gears for that, and my Atlas TH42, before I got the Heavy 10L. It should work to print them, also, but I'm not educated enough in the right areas to really figure that out yet. And there is the whole can't reach much of anything including the 3d printer.
I had planned on having all that sorted out by now, but my back has not been cooperating, and COVID-19 has made it harder to get the treatments that might solve the problem for a while, anyway. I do have an appointment this week to get another set of nerves burned, and that may let me do stuff again. I hope. If it works out, I'll be playing with mine again, and may be able to help you too.
Seems to me Steve Wells has some info on the various sizes of change gears SB has used, but I need to go do some stuff for SWMBO, who has her own medical problems, including much worse back troubles than mine.
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Monday, September 21, 2020, 09:28:13 AM CDT, Kit Maira <kit.maira@...
"well, I stand up next to a mountain- and I chop it down with the edge of my hand"