Removable cartridge cleaner

A spring tensioner comprising:

• a bracket;
• spaced legs of the bracket;
• a housing assembly mounted to the bracket and configured to extend between the legs;
• a dust guard member mounted to the housing assembly;
• track portions of the legs for slidably mounting the housing assembly and dust guard member to shift along the legs of the bracket;
• a cover portion of the dust guard member mounted between the housing assembly and the legs and sized to extend between the legs to restrict debris movement through the bracket legs and debris accumulation in the track portions along which the housing assembly shifts.

A spring tensioner comprising:

• a bracket;
• legs of the bracket;
• track portions of the legs;
• a housing assembly extending between the track portions and configured to receive vertical and rotational forces thereon;
• an lower block assembly connected to the housing assembly and configured to slidably engage the track portions;
• an upper block assembly connected to the housing assembly and configured to slidably engage the track portions;
• at least one of the upper and lower block assemblies configured to extend beyond the track portions;
• mounting portions of the at least one of the upper and lower block assemblies positioned a first distance from the housing assembly;
• leg mounting portions of the legs positioned a second distance from the mounting portions;
• and
• resilient mechanisms configured to resist vertical movement and engage both the mounting portions and the leg mounting portions,
• wherein the engagement of the upper block assembly and lower block assembly with the track portions and the engagement of the resilient mechanisms with the leg mounting portions being operable to resist the rotational forces applied to the housing assembly, the first distance and second distances selected to reduce friction between the resilient mechanisms and the leg mounting portions thereby providing smooth vertical travel of the housing assembly.