I ended up making one,I musta made a mistake because it worked flawlessly! Less than 10 secs off.
7/8" x 14 x 2" long HT bolt,$3.50,+ a long 1/2" HT bolt I found in my manshed,$0
I cut the bolt head off,then rounded/domed it.
Then ground away all the threaded portion to about 3/8" to insert into the crank end,also rounded off.
Then counterdrilled the end of the 7/8 bolt to take/locate the dome end of the pusher bolt.
Bit of grease on all the threads and domed ends to limit the friction and BAM!