I've been working a lot on my 1hbh lately. I had been using an eastern backhand grip, but recently tried using more of a continental grip and it's been working a lot better for me. I wouldn't say it's straight continental, but maybe somewhere in between continental and eastern bh. It's actually the same grip I use on serves. Do many people use this kind of grip for a 1hbh? It seems like a lot players who still have a 1hbh prefer the eastern or western grips now.
If I am hitting a onehanded backhand on serve returns, I will hit through it using a Continental grip.
The reference point of the Continental grip is to feel like you are hitting the ball with the back of your hand. Therefore, you want to maintain a straight wrist/hand/forearm through the stroke.
Players that are not used to this grip will have a tendency right before impact to curl up their hand/wrist towards it being laid back. This is a natural tendency and you will do it at times even when you are determined not too. However, this also produces shots that pop up and have a tendency to sail long.
I dont usually advocate curling up the wrist before impact for people learning to hit with a Continental for various reasons. However, once they have developed a stable wrist and they are able to keep this wrist stable throughout the swing and well into followthrough, then a little curl before contact can be what the Doctor ordered to add a little "pop" on the ball. This takes real real good timing which is why I would want to see someone master the straight wrist first through the stroke.
The feeling you want is that you are brushing the back side of the with the ball back of your hand wrist and you maintain that until you have your racquet well into followthrough and you are in the "air the armpits" area. You should feel the impact of the shot slightly concentrate against the back of your hand/wrist as you go up through it.
Also, another reference some players use is a "knuckles down" to help them stablize the wrist area throughout the stroke. The knuckles down has to do with your forward swing to contact to help ensure you hit the ball with a square racquet face.