An authorized repair center might have what you want.
The Fast Deer is a Chinese made Air-rifle. It's model KL-B3. If you want more information go to the attached link at the bottom of this page.
It all depends on the condition of the air rifle. Without more information it is not possible to answer you.
Yes it can but getting the current rifle "Tuned" by an expert will get you better results. Tuning will make the spring and trigger perform better.
This rifle must be rare, I can not find any information on it. I did find the following information on these BSA rifles in Mint condition. ( Yes it would be a collectible) Goldstar $450 Superstar $420-$480
You will have to take it apart. Each model is different so you will have to find a diagram of the rifle.
It hard to find information about this line of air guns but I know they were made by "GAMO." I found a magazine add for a new one on the web that was dated 1972
The tuning fork produces sound waves when it vibrates in air.
Are you sure it's not a Benjamin air rifle. I know of "NO Jefferson air rifle company", But Benjamin air rifles have been around a long time. If so what is it you want to know.
There are a number of places that an individual can find BSA rifle scopes. Some of the places you may want to try include BSA Optics and Air Rifle Scopes.
A reverse tuning slide allows the air to flow smoother through the tuning slide area of the trumpet. In most trumpets, the top end of the tuning slide fits into the leadpipe creating a small obstruction where the air meets the rim of the tuning slide (inside the leadpipe). On a reverse tuning slide, however, the tuning slide fits over the leadpipe, eliminating that obstruction and allowing the air (in theory) to flow smoother.
In radios that aren't solid state, and use variable capacitors for tuning, the air-dielectric variable capacitor is the almost universal choice for radio frequency applications. More information on air variable capacitors is available at www.orenelliottproducts.com.
Go to airsplat and you should find what your looking for. Or you could look up "air gun repair" on the web.