Eric, before you buy them , try making them.I have done it before.
Go to the Jaycar site and look under couplers , there are several types that are suitable. Then use clutch cable or speedo cable then fix a knob of some sort to the end.I know you are a handy man so give it a try.
http://www.jaycar.com.au/productResu...x=0&SUBMIT.y=0