As I said with combatstick, someone has rewired the f15 suncom Throttle to make it usb?
Im the owner of one and Im interested on make it usb suitable.
This is pretty simple to do, because Suncom SFS throttle use a 8x1 and 4x1 Diode matrix for grips buttons and HAT's.
Then you have two options, just add a new USB Controller (e.g. Arduino+MMjoy2) without modifications in throttle grip wiring, neither in the connector of cables coming from grips inside base.
All circuits inside base is erased and replaced with the new USB controller.
or, the ideal option, is add an extra wire for button #21 - the side switch or left side of left grip, because in original scheme the two sides of switch (ON-OFF-ON) was wired as single button.
By add just one more wire you have a button #22 .
Optionally can add some switches/buttons in the base, but this don't interfere in grips connections.
In this topic - in Portuguese, Google Translator can make understandable in Spanish: this mod is well explained and illustred:
Besides simple to do, this MOD have low cost - 10/15$.http://www.gavca.com/phpBB3/viewtopic.php?f=49&t=24168&p=171654#p171654