Made so i could have just incase i have more units needing replacement belts. The toothed counter belt is used on the A77, B77 and PR99 as part of the tape counter assembly. It connects the counter idler wheel (which in turn connects to the brake drum via the long black belt - sold separately) with the actual counter gear mechanism. Look underneath the counter to see it! The toothed counter belt is an item that needs replacing at least every 5 years. It gets brittle and is commonly broken on most old machines. We offer a freshly manufactured new replacement belt. NOTE: Some early models of A77 used nylon gears in place of this belt - so please check you actually need it.