Save money Easy DIY repair Popular mini bike chain Allows precise chain lengths The master link for #35 chain is a good way to tailor your mini bike’s chain to a very precise fit Simple DIY repairs are a good way to save money The master link for #35 chain is a good way to tailor your mini bike’s chain to a very precise fit. Simple DIY repairs are a good way to save money. Master links are used to connect each end of an open loop to create a closed loop chain (also known as a fixed length chain). You can also use a master link to repair chains with a busted link – just remove the bad link and replace it with a master link.