More worrying is the vibration in the handles, I fitted new blades with no change, anyone have a fix for the blade plate, I don't have a balancing cone.
Unless there is a chunk or so missing from the blade disc, it won't be a balance issue anyway. It could just possibly be bent, though.
It's a little difficult to check, but can be done on the mower. The way I'd do it, is to tip the mower over, and take the blades off. Then set up a magnetic base under the deck, to hold a rod just in contact with the bottom face of the disc, and turn the disc by hand, to see if any 'wobble' is evident. The fluting and bolt recesses of the disc make using a dial indicator impracticable, and that level of accuracy isn't necessary anyway.
A bent crankshaft will also produce wobble here, but that's very unlikely for an engine that has had a flat blade disc fitted. Bar blades are a very different story...
If the disc is bent, replacement is the simplest fix - the ODK Shop has it
HERE.
Just a tip if you're planning to keep the Big Bob; they cut much more neatly if fitted with four blades. Handle heavy going better, too.
