Ahem. After a rebuuild of any quality, use the "auto store cheap" fabric filter for about 300 miles. THEN switch to the screen (brass or stainless) filter.
Could use another fabric filter but that 1st filter's life depends on the clutch and steel materials and newness. Some new frictions release a bunch of micro-bits that gunk-up/clog the fabric filter.
Rebuilds: i still do em (north AL). Toughest cost for me is case clean and prep ($120 or more). + rebuild effort ($200) + parts costs (usually a smoking deal on shelf spares.
The last rebuild ran into lack of a Front Pump core. Buyer willing to buy a $300 rebuilt front pump, but i said wait until we find another core, or we'll use my last minty 121 Pump. Well we found a core in a car, but he's been busy, no hurry but my bench is occupied. Maybe soon.
As for my opinion: TH400 builds seem more practical to do that rebuilding Q-JETs.
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