Got a HW35 export model in .22 ,not been used for a while ,took it out on the weekend and it sounds terrible , twang from the spring upon firing , wondering wether to order a tune kit or just clean and relube ,can,t recall if there is a spring guide in this rifle or not ,usually the twang is from the spring out of shape and tension ,from previous guns I,ve done ,anybody done a HW35 lately ?