Im with Paige on this one.
WICO Repros are highly desired. Both for Classic Restoration, as well as use in Authentic Emulation machines (especially Robotron, arguably one of the best games ever made).
While people with older Wico sticks might be able to restore them with offered parts... thats not really a bad thing. Realistically, you would be making profit off of each part. It might actually be more profitable that way.
But either way... most older wicos will need at very least.. all leafs replaced, a new grommet, and a new handle. The balltops are usually scratched up... and shafts usually corroded. Grommets may be stiff / cracking.. and the leafs springs have fatigued too much. All that pretty much leaves.. is the Base shell.
While most wico 8ways do fairly well without too much wear on the top edge of the base... the 4ways did seems to wear out after some years. IMO, the Bally Midway Pacman sticks were superior for 4way operation. They have at least one replaceable restrictor part... and the thick steel top restrictor takes a very long time, in an busy arcade, for any wear to come into play. If you remake this stick and its parts... you can sell its parts to restore the other sticks that used them... such as the Trigger sticks (seen on Tron, Discs of Tron, Satans Hollow, and many more classics).
I think you should not really concern yourself with "fight-sticks"... because Leafs are not really good in fighting game applications. And if you try to remedy this using different mechanical means... then it ruins the classic wico feel that we are looking for.
There are multi-thousands of classic arcade machines in basements and bar-cades all over the world... and sadly, many are fitted with semi-working, destroyed, or sub-standard replacement sticks.
Add to this the multi-thousands of Emulation fans... whom also want to play classics with the Authentic feel that they Remember and Love (as well as those new to this... and still wish to have accurate feel / control)... and you would have so many orders that you might have trouble keeping up with them.
Wicos are Proven with long Lasting quality, and outstanding feel. No other stick feels and reacts like a true Wico. And any stick that looks similar.. will be immediately questioned with extreme prejudice. Rightly so. Why mess with near perfection? People know what they really want... and are begging, pleading, and very willing... to pay for it.
I do also vaguely remember the Wico balltop microswitch version that Paige pointed out... as being really nice too (I used to manage an Arcade, and saw / repaired pretty much every controller made). Sadly, I never got to pick one up for myself... so Im just going by a 18? year old memory. I recall they were far more durable than the Happs sticks of the time. They also felt much better, due to the rubber grommet. I also loved the balltop grip (and look) for most games. I wouldnt use them for Robotron, but I think they might be a nice replacement for the happ comps (for fighters).
Anyways, I think its time we kickstarted accurate Repos of classic controllers .. and maybe other things too...