Depending how close it is to the fiberglass, put a small amount of heat to the 
fitting with highly directed propane flame alternating with penetrating oil and 
heat again.  This drives the oil around the threads.  Then use the extractor
 s l o w l y.  BTDT many, many times with tractor restorations.  Where every 
fastener is stuck after 70 years.

Bill Dakin

> On Apr 28, 2017, at 8:26 AM, Joel Aronson via CnC-List 
> <[email protected]> wrote:
> 
> After greasing the rudder post I managed to snap off the grease fitting.  I 
> was planning to use a screw extractor to try to get it out.  Any tips or 
> tricks before I make it worse?  If I have to drill and tap, what size tap?
> 
> Thanks!
> 
> -- 
> Joel 
> 301 541 8551
> 
>       Virus-free. www.avg.com
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