Thank you for your advices.
The first, I am not used to handle a GUN. Good citizen like me (^_^) has no chance to shoot it. But if possible, I would like to have a SAA which has a 7-1/2 inch barrel, one-piece wooden grips. My favourite one. But it costs maybe more than $5,000. Expencive....
Well... if a sub-base is flat, I have no reason why I complain about it to manufacturer.
It is better for me that PC is to be a fly by night company. Because If I can not contact PC, I can give up anything.
But it is not. I can contact them. But they do not take duty which they should take, I think.
It is not a good for me.
After all I must let myself understand that American manufacturer is unkind to a persom who lives outside USA.
I ordered a book which you recommended to Amazon Japan. I will take it in maybe 10 days. I am looking forward to its arrival. Thank you for your recommendation.