Today’s post will be in two parts. First, I’ll catch up on social activities and then share my technical woes. On Friday afternoon, Donna marinated boneless chicken thighs with olive oil, garlic and fresh herbs. I grilled them on the Weber Q for dinner. My daughter Alana eats a modified vegan diet to control lupus and our granddaughter Gabi is vegan. Donna made teriyaki tofu bites for Alana and I grilled a hot vog (vegan hot dog) for Gabi.

We sat outside at our table and enjoyed the sunshine while we had a chance. Other than Wednesday, we’ve had periods of rain showers every day since we came to Arlington.

Dinner in the open air and sunshine – clockwise from left – Donna, Alana, Lainey and Gabi

Saturday evening we were all invited to go to Alana’s mother’s house and have dinner with LuAnn and her husband Jerry. We had a break in the weather and enjoyed hors d’oeuvres outside in the backyard. LuAnn set a table of appetizers including spicy shrimp on marinated cucumber slices.

Appetizers

We moved indoors for dinner which featured grilled salmon, roasted potatoes, corn on the cob and asparagus.

Dinner table – clockwise from left – Donna, LuAnn, Lainey, Alana, Gabi and Jerry

We all had a good time. After dinner, Jerry and I sampled a couple of fine Scotch whiskys. First up was a glass of Ardbeg Islay scotch – very smokey and complex. Then an 18-year-old Glenmorangie Highland scotch. Good stuff indeed!

The rest of my weekend was spent trying to complete my shock absorber installation. Before I get into that, I want to talk about properties of materials – specifically, rigidity and deformation. Any mechanical engineer will tell you that there’s no such thing as a totally rigid material. Everything flexes or deforms to one degree or another.

An extreme example happens everyday. Have you ever been stopped in traffic on an overpass? Did you notice how you could feel vibrations and even sense movement when a large truck passed by on the opposing lane as you sat stopped in your car? That’s the concrete and steel structure of the overpass slightly deforming and flexing temporarily from the moving weight of the truck.

Materials have limits of flexibility and deformation. Elastic deformation occurs when the force is large enough to deform the material (yield), but it allows the material to return to its original dimensions. Plastic deformation occurs when the force applied is large enough to exceed the elastic limit and the material is permanently deformed – it doesn’t spring back to its original shape.

When we apply these concepts to fasteners – such as nuts and bolts – we want to tighten the fastener enough for it to yield within the elastic deformation range. This causes the threads of the bolt and nut to fully engage and maintain their tightness. When we remove the nut from the bolt, the threads spring back to their original shape and can be reused.

I’m telling you this to explain why I spent the rest of my weekend struggling with a nut and bolt. The lower bolt on the driver’s side shock is locked solid. I worked all day Saturday and again on Sunday with the cordless electric impact wrench and haven’t been able to budge the nut. I also used a 24-inch breaker bar and pulled myself up on it from underneath and bounced my body weight until my arms gave out. I believe the mechanic that installed the shocks over-torqued this nut and deformed the threads permanently – plastic deformation – and they refuse to unlock. I finally threw in the towel last night and gave up.

Today I’m looking for a mobile mechanic that can come over with a 1-inch impact driver and pound the nut off. Once off, I’ll inspect the fastener carefully for permanent distortion or cracks before I install the new shock. If I find any damage, I’ll have to replace the fastener.