G'day Fella's,
I have been through the process of drilling those bolts out.
These days if there is just one to get out and its a short bolt (sometimes they are long) I will drill it out and re-tap it.
I normally buy a $10 mower just for the parts if I need a boss.
I have drilled all 3 out before and put through bolts, nuts, washers before also.
Another thing I have done: if the boss had short bolts snapped off, flip it over and tap threads into the other side of it.
If you have scrapped briggs engines laying around, the conrod bolts have the same thread and work perfectly.
My understanding of this arrangement is:
The centre bolt fixes the blade carrier to the out put shaft.
Turning effort from the engine is transferred to through the woodruff key to the boss.
The boss being attached to the blade carrier via our 3 small bolts, transfers torque to the blade carrier.
The 3 bolts also stop the boss riding up on the out put shaft.
Cheers from Mark
Last edited by mark electric; 17/11/14 04:12 PM. Reason: add some detail
