The US factory’s aerospace-grade spring samples are technically excellent – they meet or exceed all the tolerances specified – but the spring sound is not yet perfect. It’s a little too sharp/high pitched. Either the material alloy is off or they were heat treated a little too long/too high a temperature is my guess. Or maybe the sound dulls a bit over time and with corrosion of the original springs after 30 years.
The factory suggested I have the original springs analyzed at a material analysis lab – I have sent off some original XT springs to a lab. They can determine with reasonable accuracy the content of the original springs. We should know more next week.
Meanwhile the main factory is still preparing to finish up production of the remaining parts – inner assembly plates, boxes, inner foam, outside foam, and ultra compact cases. I am hoping to have these completed parts, key samples from the new mold supplier, and all the springs by early November.
The other parts completed earlier this year and are sitting in boxes waiting to be assembled: original die cast zinc powdercoated cases, PCBs, ribbon cables, barrels, USB cables, and flippers. Thanks everyone for hanging in there as we perfect production of Brand New Model F Keyboards!
While you wait for your order, I am asking that you consider, if funds allow, getting a Model F First Aid repair kit for long after production ends and orders are no longer taken. The more kits and parts are ordered and out in the community, the greater the number of extant Model F’s will be in the decades to come. So far we have over 3,800 extra barrels and flippers, 60 extra factory made inner foams, and about 133 first aid kits ordered for ~850 keyboard orders.
Feel free to pick free/other shipping when adding small extras to your original order and I will combine the shipping.