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RESPONGING HUBS When your tyres are worn out, here's how to reuse your old hubs with replacement sponge "doughnuts". 1 Clean off all rubber and glue from the surface of the hub. 2 Remove any rubber from inside the grub screw head with a pin.3 If the grub screw head is worn, replace the screw. Note: If you are sending your hubs off for responging do the above, as a minimum, beforehand. 4 Put the cleaned hub on an "axle" and tighten the grub screw. I use 3/32" piano wire bent into an "L" shape app. 1.5" x 0.5" (as shown below) as this is easier to hold / grip.
6 Apply a thin coat of Evostik to the entire inside surface of the sponge with a small screwdriver and leave for app. 10 minutes to dry. 7 Pour a small amount of cellulose thinners into a shallow dish to a depth of app. 3mm (if you are using bossed hubs, the depth needs to be sufficient to reach the main hub surface). 8 Hold the sponge in one hand and the axle / piano wire in the other and dip one end of the sponge and the blank end of the hub into the thinners (as shown below) for a second or two. This softens the glue without dissolving it.
9 Push the wetted end of the hub into the wetted end of the sponge and don't stop pushing until the wetted end of the hub is a millimetre or two from the dry end of the sponge (as shown below).
11 Put the hub to one side and leave for app. 10 minutes for the thinners to evaporate off and the glue to bond. 12 The responged hub is now ready for trimming / grinding to size. Stuart Strachan
NOTE - It is important to follow the safety instructions provided with the products referred to in this article. Copyright © 2002 British Slot Car Racing Association All rights reserved No liability is accepted for this information or any use to which it may be put |
