Jammers

A jammer is a tool, which can be used to obtain free credits on fruit or vending machines; the most effective jammers are piezoelectric crystal devices, which produce small electric discharges.
Jammers can be made with ease, piezoelectric crystal devices are found in gas heaters (the bit that sparks) these can be removed and used for this purpose. If you cant get your hands on one of these a gas cooker sparker (the type commonly found in pound shops) with the end removed will do, electric lighters can also create the type of discharge needed.
All these items will be basically the same consisting of two metal wires, which protrude out of their power supply, which is usually an insulted box small enough to fit discreetly into a pocket. To save possible disappointment make sure you can see a blue spark jump between the two wires this will mean your jammer is working correctly.
Then find a machine that is not in a to open area and hold one of the metal wires to the coin slot press the ignition button volia a free credit repeat until you have as many credits as you want this will most probably result in free money or goods e.g. cans of soda from a vending machine.
However some modern machines have plastic casing around the coin slot and so on down the tube so that electrical currents cant be pass down it and free credits obtained. Remember, as with all electrical items Jammers can be dangerous so use with care and don't do any thing stupid with it use your common sense and go make some free money.

Strimmers

Strimming is another method of receiving free credits on fruit or vending machines this time not using an electrical device but a thin strip of plastic with a curve at the end which a coin (say 20p) could sit nicely in.
The plastic strip with coin is then inserted into the coin slot and pushed down into the tube and then pulled out quickly. The coin will drop but spin as it does this will confuse the machine as it tries to work out what type of coin it usually wont be able to and the coin will be returned but the credits will be credited.
Plastic ties work very for this and they are available from D.I.Y shops at a very cheap price.

Blocking

A method used all over the world by con artists and scammers it's a very simple way of making a bit of cash all it consists of is blocking the pay out tube or coin return slot on a fruit, vending machine or telephone box, to block a coin return slot on a telephone box, a phone card folded in half and pushed into the coin return slot will do fine it will capture any change given to people using the phone box it requires some skilful removing so people aren't likely to bother for their small amount of change e.g. 20p however change builds up very fast and if your phone box is in a position you could end up making £10 a day plus, you will soon be able to take the card and change out in seconds with a bit of practice unlike the unexpecting public. Similar blockers can be used for vending machines.
Fruit machines blockers need to be a bit more discreet people aren't going to put up with losing Jackpots and your blocker will soon be detected a fruit machine blocker must take form of a small shallow box which must be situated underneath the payout tube so it only captures a few of the coins e.g. £3 of £15 when your return your blocker should be full great way to makes some free money.

Refill Keys

Refill keys are used by arcades, pubs ect, owners to check how much money is in their machine, or how much the last player put in or won, on some machines refill keys can be used to adjust volume levels etc.
They are perfectly legal and used increasingly by players who want to get one over on their arcade however use your common sense when using a refill key, your likely to get banned or your legs broken by the arcade owner if you get court using one.
Most machines have their keyholes just above or below the payout reservoir.
Refill keys are easily obtained on the Internet from as little £4 with a universal but only work on the more modern machines. User guide, some people have been reported to be selling them in service stations for £60 with no guides nothing, don't be lured into their selling tactics shop around and you can get one relatively cheap with guide telling you how to use it. [BUY]

Potting

An old yet interesting method of obtaining cut price credits/goods from fruit/vending machines it only really works on older/basic mechanisms it consists of adding weight to a coin thus fooling the machine into thinking it is one of a higher value this can be done with duck tape ect,for example taping an 2p to an 5p coin thus making the machine think it is a 50p coin. Some foreign coins have the same effect, Obtaining credits for far more than the coin is actually worth.

Laser Pointers

This method works on most new machines, which have hoppers (e.g. newer £25 jackpot ones).
Newer machines have laser sensors that tell the machines when to pay out coins, all you have to do is get 20+ coins in the bank when collecting the coins point the laser down the coin slot at around 48% down, this will lead the machine to think that no coins have been collected (as the laser is unbroken) and it to empty itself, if used discreetly this can be a superb method.