I don't lacquer it afterwards but I will wax it to protect the finish.
By the way, if you've cracked or lost the protective dome, visit my page on Glass Domes.
It costs about £30 but another excellent book for general repair technique is Joseph Rabushka's 'Repair and Restore your 400 Day Clock' (about £15). Another source of information for repairers is Mervyn Passmore's automated Anniversary clock identification system - which is FREE!
The only other thing that might be required is a new mainspring (£35) but it's fairly rare.
If you'd like the movement and base etc polished add £100.
The suspension spring is the most fragile part and if it's damaged a new one is required (I only use genuine Horolovar suspensions - £40 fitted plus £5 each if it needs a top/bottom block or a fork).
I also offer a suspension spring identification service if you want to buy a suspension and make up your own but be aware that these springs are delicate and easily buckled while fitting the top and bottom blocks and fork, which will almost certainly render it useless.
The humble 400 day clock is also known as an Anniversary clock (as it's supposed to run for a year on one winding), or a Torsion clock (a term I prefer but which is not widely recognised outside clock making circles) but all three terms are interchangeable.
An advantage to the collector is that 400 day clocks are largely unloved and under-rated and often, therefore, ridiculously cheap.I won't charge for resetting (once) but you must bear the cost of postage both ways. If you're looking for information on a more sophisticated type of torsion clock, visit my page on Jaeger Le Coultre ATMOS clocks.When I first started my antique clock collection, the first thing I noticed was how little I knew about the clocks I had.This is not because the mainspring is fifty times longer!It's because it's stronger to drive the higher gearing introduced by an extra wheel and the fact that a single swing of the pendulum typically takes seven and a half seconds instead of a fraction of a second in many other mantel clocks.The French firm Claude Grivolas also made 400 day clocks mostly with integral case rather than under a glass dome.