I've held off in hopes someone had easy access to a puller of their own - mine is carefully packed away in a weather tight container for long term storage with my spare VP-44 until it's needed - which I hope is NEVER! :-laf
As I recall, the bolt/thread size is the same as the bolts used to secure the Cummins air horn to the intake manifold - but I'll get out my puller, takes some pics and provide measurements so other guys can easily make up one of their own - $35 is WAY too much to pay for one of them...