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southace said.. The ronston replacements are over $300 each I need about 10 of them!
i think it's something to do with the pre bend in my swept back spreader rig. If the mast was straight I wouldn't have such a problem.
The main issue with slugs not sliding freely is to ensure the that the slug profile matches exactly with the internal track profile. The Ronstan roller cars are supplied with about 20 different track profile inserts. Most masts with the track incl in the extrusion profile have a "T" slot incorporated into the bolt rope profile and the inserts are selected to suit.
The full length batten cars slide well because the batten places the car in compression and the roller balls are effective. The intermediate cars are in tension when hoisting and the roller balls are ineffective. As the inserts are only about 6mm long separated by the car length of about 70 mm they wear heavily and tend to jam.
The other issue is the length of the cars, approx 75 mm results in a huge stack height of the lowered sail.
For my new "offshore" racing main I have CNC machined a set of slugs to suit the mast track profile exactly as the off the shelf slugs are not the correct profile. This allows for a jamb free fit in the T slot and a nice low stack height when reefed/ lowered.
i have as a result a set of 9 Ronstan cars which I no longer have a use for and would have been happy to give away.
unfortunately not to some Seabreeze members.