Duct tape
We call it 90mph tape. It will hold rusty fenders on your car up to 90mph. According to my certified testing lab.
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$150 for any part is forcing a new stick. Kinda the old car money pit. It’s probably made for $10.
I think you like beating the challenge. What I do.
I’ve not heard good things about TM support. And the buttons and stem breaks are most common, warn gimble to follow.
Like CH, TM and ever x52/x28 was best stick for it’s day, without super expensive route
Why I switched to a more hefty gimble and better support and wen VKB WWII grip stick fir $120, $170 after taxes, tariffs and shipping. Its the best for the price, with ball bearing gimble, triple springs, and 3 inner tension adjustment screws
Most are set on the stick they grew into.
So up to you, fix or switch.
Or, buy a repeat and have spare parts, just not the most common such as this.
I’m sure I didn’t have to say this, you know.
Beside that you may prov the theory wrong and find a cheap fix.