Citoyen du monde wrote:
thanks , made one yesterday , not looking great but seems to work .
As long as you get the thickness right, it should work aceptably well. I once got a derailleur to work without even having the three tabs. Obviously, with teh tabs it worked much better.
Without the tabs, the washer need to be slightly too thick to work, I think. And then you'd need to loosen the gear hanger bolt every time you take the wheel out.
The correct thickness puts the mech at the right distance from the hanger, so that it touches the hanger but still spin freely, you need it loose for wheel changes. The tabs stops it rotating too far forward and holds it at the correct angle.