I had to remember to take along a hacksaw so I could get it home though - I can't fit 3 metres of anything in my car. Drainpipe's not heavy, I suppose I could've walked it back. But people look at me funny already.

I cut it to length, sanded off the lettering printed along it, fitted it into my rudimentary winding jig and gave it a coat of polyurethane varnish. The winding itself was done with 0.4mm diameter magnet wire, for a wound length of about 520mm - so I guess there are approximately 1300 turns. Once the secondary was wound it had another 2 or 3 coats of polyurethane (still on the winding jig, so I could continue turning it as it dried and prevent too many aesthetically displeasing drips or runs in the coating)

The secondary's mounted in the closest-fitting pipe endcap I could find, which is bolted down to the baseboard of the coil. The endcap didn't really fit the drainpipe all that well, so I epoxied some wedge-shaped pieces of perspex to the sides of the secondary former to make for a tighter fit. I also fitted a long nylon bolt that passes through holes in the side walls of the endcap and the bottom of the secondary former and stops the secondary from lifting out.