Tried to buy a nylon "duck head" for my tire changer, ended up breaking it, and now trying to get it back into operation and trying to fabricate a plastic guard or two.
Turns out there are two styles of "plunger shafts". One tapered and one not. I was taking off the head to see which I have.
Of course one allen set screw was wallowed out. Drilled it but apparently not enough.
There's a ledge at the bottom of the shaft's machined mounting area that captures those two set screw as well as two other set screws that clamp to the machined area and a bolt with washer that goes in from the bottom.
Hopefully all that is overkill. It was really on there, so when I had the bottom bolt and all three set screws out, plus the fourth one drilled out...
I hit it a few times with a big hammer.....and broke about 70% of that ledge off.
YAY!
So moving on...I'm guessing it's at least 25-30 years old US brand...what size and thread pitch are the set screws?
M10 1.5 ?????
Guess what neither Lowes or Home Depot carries? Anything larger than M8. How about ACE?
Not really. But they did have this-
The trick is, nothing can protrude into the "ramp" area that seats the bead when installing.
I think if I use the one good set screw in the RH hole, the cap screw can be used in the LH hole and not interfere.
...and the clamping force of all four plus the bottom bolt will hold it...without most of that ledge.
Otherwise I guess I'll try to build that ledge back up with weld.
This is the mounting ear from a $2 electrical box. It has counter sunk screw holes. The sharpie mark is the radius of the duck head "ramp".
I'm hoping I can drill and tap three holes on the inside of the duck and then grind off the screws, flush with the ramp.
Stay tuned for part II.
I wonder if there was a moment during the design phase of that part where the engineers all gasped when it took it's final shape, and everyone shouted-
That looks like a....... "duck"!
