Does anyone know where I can find a bottom firing button assembly (button, spring, screw) for Super T's 1800 Workhorse series (not the Telescopic)? I have some extra tubes, a top cap etc., but no button. Super T doesn't seem to have any extras. Maybe there's some alternative parts that would fit? I'm sorry they're leaving the business (another casualty of the clones). IMHO, their mechanical mods were the best.