Needle mark become noticeable when sewing blackout curtain material. The trouble is the material fibers are melting and hardening occurs due to needle heat. Use a slimmer needle and reduce the speed. Recommended DBx1 # 11 If there is needle breakage use the next size needle up and keep the speed low,

We find in the tropic's its common to have a shaft bearings seize up if the machine sits unused for a long period of time. This usually...