depending on what version you have, if the stick is an ls-56 it’ll look like this:
If thats the case theres a few options.
the microswitches are a attached to a pcb board. so to replaced one, you’d have to de-solder the busted one,
and drop in the new one, connecting the necessary wires to the microswitch (this is because as far as i can tell theres no where you can get a 56 microswitch that isnt a fastener type end)
and here comes the next point. Theres nowhere to get JUST an LS-56 microswitch assembly. you can get switches alone but only fastener type (as mentioned). so when it comes to just dropping in a replacement with no soldering or wiring whatsoever, the best bet would be to get an LS-56 joystick (from a fine shop like Paradise Arcade or Focus Attack) with the Microswitch PCB and using the rest of the spare joystick for replacement parts. (tho i will go ahead and say, the LS-56’s in the HSS-0136’s have a short shaft you cant find anywhere else so no need replacing that)
NOW if the joystick isnt an ls-56, and has a different kind of assembly it may be easier but it would also involve crimping and possible soldering.