Take it to your local framebuilder who has a Milling Machine, get the slot filled with brass/silver then have the slot re-machined so the slider doesn't flop about hideously like it does now.
@Keppel started
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Take it to your local framebuilder who has a Milling Machine, get the slot filled with brass/silver then have the slot re-machined so the slider doesn't flop about hideously like it does now.