Reducing hole diameter in fan query

[frolingdual]

I purchased a new fan for my boiler , the replacement has arrived but the hole for the motor spindle is about 1/2 inch and the old one only about 3/8 inch.

I'm wondering if there is any way I can pack it out, obviously It must be dead centre. I am thinking about trying small bolts but would appreciate any ideas.

 

[warno]

I'm confused about your question, you need to make the hole in the new fan larger for the factory motor shaft? Or smaller?

Pictures might also help.