Ian. Both stylus (stylii ???) and gramaphone needles are available on line, all you need to know is the model number stamped on the old stylus.
When I used to help with a mobile disco where records could easily jump when operating from a wobbly village hall stage we used to tape a coin on the arm. Best not try this on a good quality record deck as it won't do it any good longer term.
This is my oldest record player.