Fretboard radius

Hick81

Hi all. This might be a daft question but having googled it and YouTubed it, I can’t find an obvious answer. 

Bought a Musikraft neck (used on eBay)  the other year that has sat in my wardrobe until now. 

I’m putting together a Jazzmaster and was about to order a Staytrem bridge - it asks for the  radius. And for the life of me I can’t remember what it is.

Is there any easy way to measure it? (Without having to buy any special equipment) 

thanks in advance 

Jonathangus

http://guitarhack.com.au/printable-radius-gauge/

Roland

Draw arcs of different radii on a piece of paper using a pencil and string. Don’t forget to label them. Cut them out with a pair of scissors, and offer them up to the fretboard.