Greg,

When I switched, the new traveller car was wider (longer?)and carried more balls, but still ran on the same track. You might check with a local Nacra dealer or even directly with Performance Catamarans. You might contact Harken and give them the dimensions of your current track and car and ask them what is available for your track. I think their products have evolved since 1989, but Performance still uses the same track.

You can continue to use your current traveller car, but I think you will replace the balls more often to have it work well, and I don't think it will ever work as well as the larger traveller car.

I never used McLube on my traveller, so I cannot compare it to the water with a little Joy in it. The Joy is cheaper though.

There is one more factor in the smooth operation of your traveller, and that is the line with which you control traveller position. It needs to run smoothly through the roller fairlead on the traveller car. We usually had a separate, smaller diameter line for this and would tie the end of it to the end of the mainsheet. We positioned this knot so that when the traveller was all the way out, the knot would prevent the traveller from hitting the end stop. It saves wear and tear and helps to prevent what happened to Rolf (tearing off the traveller stop).