I have a Left Hand bolt Winchster M70 and like the safety as is , I do not think safety's are interchangable due to threads being left or right but I think Gentry in the US might help you. I see Don Heath would rather have the safety on the left and yes for a urgent snap shot it may be a second quicker with safety being released by push of thumb which is curled around wrist of the stock but some shooters do not grip rifle around the wrist but straight and therefore the safety is in the correct position also if you have a right hand bolt M70 with safety on left and you sling your rifle on right shoulder while walking the safety may catch on something or slowly be released by contact with your body . All the above problem can be solved by getting a good double with tang safety and everybody is happy!

Steve