Since i use golf balls on my machines i need really decent counter weights to make them work and work well. I use coins as ballast contained in knex capsules so that i can make up for the extra weight of the balls.
These are the most standard ones that i would use.
Step 1: TYPE A
This is TYPE A of the capsules
Its best suited to coins 13 - 20mm in diameter which includes the US$ penny
Step 2: TYPE B
This is probably the least useful of the capsules but it uses the least parts and thats always a plus
Its suitable for coins 26 - 29mm in diameter
Step 3: TYPE C
This type suits coins 12 - 40mm and is probably the best and most versatile
Step 4: TYPE D
This is the most secure type but its hard to prise open afterwards and can only take small coins. However its brilliant for containing marbles or bearings.
It holds coins 4 - 20mm
Step 5: TYPE E
This is the mightiest of the basic weights.
It can contain coins 11 - 40mm making it suitable for the largest currencys
Step 6: Filling
The only other step after making them is filling them.
This one is filled with AU$0.20 coins coming to a value of $4.80.