Spiderweb coil form for crystal radio

This is a jig for making Spider web coils for a crystal radio.
There are 2 Rows of 15 Pins.
The pin holes are 3mm in diameter.
The center hole is 8.5mm.
For more information go here:
http://www.pa2mrx.nl/UK/PA2MRX-UK.htm?coil%20homebrewing_uk.htm