I have to make one for the timing belt tensioner wrench in a pinch when I was doing my timing belt. Actually couldn't find one locally and ordering one online won't get here before the end of the day.
for me:
it's just two holes drilled 17mm apart on center, off some small piece of 3/16 thick metal. I think I got that from an angle iron or flat stock.
drilled another piece of 17mm holes on a thicker (1/2) stock as a guide for me to weld the pins straight.
a spare nut of 14mm or 15mm or 12mm forgot what it is
the pins are from the end of the broken drill bit or the guide of some broken dvd rom, harder than the nail and fits into that hole of the tensioner.
weld pin using the guide to the 3/16 stock.
weld nut to the stock on the other side.
use an ratcheting wrench to the nut. use a shot piece of bolt and a large washer to keep it in place or just use as is.
This is so that in case I needed a different angle I can adjust if I just weld to flat piece handle I can't adjust the angle when needed in those tight spots.
