Just use a stainless steel split ring. In CT they sell them at most tackle shops. Try Fishing Specialist. Bought a packet a while back. Just slip two nice big swivels. One going to the sinker the other for your main line and there you go. If you buy a packet you can afford to lose them when sliding onto rocks.
you know what ive started using,xxl swivels ,size 3 i think.basically swivel big enough so that your slide cant pass through or over it even when forced,works like a charm!