TR250 brake MC disassembly

[Don Malling <dmallin@attglobal.net>]

I'm having trouble removing the hex nut which holds in the tipping valve 
on my TR250 brake MC.

Nelson doesn't mention anything special about removing it at 
http://www.buckeyetriumphs.org/technical/Brakes/MCPDWA/MC.htm

I don't have the 1/2" allen wrench, so I'm using a pipe wrench and a hex 
bolt as Nelson described. Just don't budge. I've soaked it in PC 
blaster, but no go. Maybe I just need to get the big allen wrench and 
lean on it???

Any secrets to this??

Thanks,

Don Malling