I have a Classica 105 and can't figure out how to oil it.

To fix this issue, firstly engage the mower's bypass lever properly. Replace the missing parts - the axle key or the idler arm spring. Then, check the drive belt. It should not neither be slipping over the pulleys nor be cracked. With this, check the condition and lubrication of the tensioner pulleys.

this is a problem from the needle thread tension not tight enough
tighten the thread tension right up

Take it to a dealer.

the motor could have gone out or it could be a wiring problem, only a sewing machine repair shop can tell you for sure.

I have a Husqvarna Classica 100 and need to lower the lightbulb guard so as to change the bulb. I have read the manual, but still cannot figure out how to do it. Any help would be greatly appreciated.

here is a link for a manual, but it's not free,
http://www.sewingpartsonline.com/instruction-manual-viking-105.aspx

if you need a new part
sewingpartsonline.com
sew4less.com
mastersewusa.com
premiersewing.com

I have a white 666. I can email a copy of the manual that came with it. Tattered and old but complete. I would LOVE to get my hands on a service manual. No one around seems to know anything about them and I'm afraid to let just anyone touch it. I love that machine. It has outlived two portables.

I have a copy. If you still need it, I can e-mail you a copy.

Call Husqvarna at: 1-800-474-6437. They may be able to get you a photo copy of the original owners manual.