Hi:
Love tinkering with my budget 953. Just got an adjustable Butt Plate kit from Archer Airguns ($16.99 plus $5.20 shipping). I think it is the replacement item for the QB57.
It's made of a rubber like black plastic with a nicely curved back. Travels about 3/4" up and 1 5/16" down. About 3/4" thick as opposed to the 5/16" of the 953 originlal, so it helps the LOP. Adjusts vertically and travels in an arc, which seems odd at first, but it actually follows the arc described by the butt stock as it is lowered or raised (as it's lowered or raised the butt stock pivots on your fore-end hand describing and arc).
Mounting: Ok, it insn't a perfect fit. I used the stock top mounting screw which places it about 1/8" lower than the top of the butt stock. It's a little shorter than the 953 stock, so it ends up about 3/8" above the bottom. Doesn't look bad at all. Side to side fit is flush at its widest point but it's not quite the same profile. Doesn't stick out anywhere so it looks like it belongs there ( I think all adjustable butt plates look a little odd - offset from the rest of the stock like they are).
The lower mounting screw boss inside the stock on the 953 is a round boss, supported on a thin web. Of course the hole in the adjustable butt plate doesn't match up. The plastic (synthetic) used in the stock is pretty tough, so I marked the position of the lower mounting hole of the new butt plate on the web and drilled a small hole. Don't remember the exact size but it's smaller than the diameter of the thinnest 1" drywall screw I could find. Tried to strike a balance, making the hole large enough for the screw body and small enough to maintain the integrity of the web (too small and the shaft of the screw could split the web). To large and well, you know. The drywall screw fit OK and is holding fine, so I must have gotten it about right. Sorry I don't remember the size, just use some common sense and you should be fine.
Was it worth it?
A definete yes. I like the added LOP (could also add spacers if needed). Used to shoot with the butt stock notched very high in my shoulder and now it shoulders normally. The adjustablility allows you to fine tune your position and the curved butt plate helps maintain a consistent shoulder weld.
Is it legal in sporter competition? Probably not. The Daisy parts diagram for the 753 shows an adjustable butt plate and an adjustable comb as well, but the original Daisy parts are no longer available. I saw one on an 853 in a photo on this site a while ago, so they are are out there, but you would probably have to use an original to be legal. You should check with your club first to see if they will allow it. If you are not shooting competetively, give it a try. I think you'll like the results.
I have far too much time on my hands.
Cheers,
Fatman