1929 101 new to me and has model s mag. where do I find a new rotor or good used, points, brushes ect. Also this bike doesn't have the decompressor lever on the right side, so I think I need a kill switch of some kind. What do you guys use? I run a couple of model t fords and parts are readily available, so this seems strange to find no suppliers for items that really need replacement.  

It should be possible to find and buy a decompression cam and lever somewhere on the many different sites on the web, but If you have later cam followers or for some other reasons you want a kill button, an elegant solution is doing as sometimes found on sports handlebars and handlebars for the Four, a second Indian horn button on the other side of the handlebar. Later bikes had another ignition switch with a position for "Ignition" But there is an internal difference between distributor and magneto switches (stamped D or M) in some years and not until somewhere 39-41 I think, there was a universal switch fitted.

http://indiangauge.com/MAGNETOS%20AND%20PARTS.html