Flabergasted and
humbled. I once thought I had a finger on the pulse of these DD's. Not even close. I have a black DD-Deluxe from '92-93 with an 8 amp motor.I'm really curious as to the year of yours because they could be twins but with you having a 10.5 amp motor. Never have I seen the extra .5 amp listed on these machines.Very special.
If you were to put your hand over the hose end while running the machine, does the front bag lid want to cave in. They had a problem with that happening where the cover developed cracks from the stress exerted towards the middle . They fixed that with the next design change, I believe with the swivel models with castors.
If you get a chance could you see if your model has the same symptom as the earlier but same designed models? Thankyou, Billy