You're the first style I"ve seen that makes me want to copy it. Well done.
Hey Thanks Lectroid -- that's a nice compliment
I knew from the first prototype that I wanted several things
- the arms should hold the chassis weight centered over the pivot point (unlike the Modulus design),
- the pivot point of the arms should be centered over the cradle base front to back for stability,
- the side pieces shouldn't stick up above the chassis when the chassis is adjusted flat for ease of access,
- the arms should tilt as far forward as possible while holding the chassis stable,
- they should also tilt back as far as necessary to give good access to the inside of the back panel,
- and they needed to pivot from front to back while holding a chassis without allowing the transformers or tubes to hit the cradle base.
The 2nd prototype solved these problems but created another that killed the design -- it was really difficult to adjust the tilt. The arms were isosceles triangles, with the adjustment thumbwheels directly below the pivot point -- loosen the knobs, and you'd lose control -- not a good feature.
So what I did to solve that problem with #3 is offset the knobs forward, as close to being in-line with the arms' flats as possible, while keeping the sides of the base low. It mostly solved the problem -- still gets weird with chassis that are unbalanced on the arms.
The Danelectro I'm tinkering on now has two chassis connected by an umbilical cord: power section and preamp. I tossed the 2nd cradle prototype, and a friend has the 1st, so I had to go back to wood blocks to hold the preamp. It was a real drag -- I've gotten used to the stability of a cradle. It was wobbling back and forth while I unwrapped clipped leads from terminal strips to replace the filter caps and diodes.
I'm thinking of making another shorter version of #3 for narrower amps. This one can handle a ~25" chassis without the sliding end extending out over the base. It can go longer, but I haven't needed that.
I'm pretty sure I know which pile the plans are in -- I'll dig them out and see what shape they're in.