some bike stores charge parts, not labor
and the sks chainguard (good choice by the way..excellent quality on sks products)
$20 sounds fair to put it on (if it's a front and rear derailleur bike) $10-15 for non front derailleur
since it's 3 tools actually
pedal wrench, crankarm puller (unless it's a single piece crank arm) and bottombracket spline
time is estimated for that (since things can seize and shop prices are based on 'average' time for an 'average mechanic' on an 'average bike' (so a good mechanic will do it faster...5 min sound about right for a good mech on a well maintained/non seized bike)) at 10-20 minutes on a $1/minute scale (of which the mechanic gets usually $10-12 if he's experienced (5-6 years in business))
the pedalwrench you can fake with a skinned(ground) down long handled 15mm wrench
the crankpuller..not so much, but it's cheaper (and is only needed for 3 piece cranks)
and the bb spline/key is also a one time purchase and it does actually make sense to pull the bb once a year to regrease and let moisture out of the frame (especially on steel) but even on alloy
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