Glue the spool top to the spool base with Cyanoacrylate glue (i.e. Crazy Glue), then you may have to drill out the six holes for a proper fit of the six Alnico magnets. Use a little CA glue to hold the magnets in place as well.
Wind the pickup with several thousand winds (exact number will vary depending on the impedance you are trying to achieve) of coated wire (42 to 44 AWG is typical).
The magnets are Alnico .195" dia X .650" long purchased on eBay.